Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS - OBLIGATIONS, ASSETS AND FUNDED STATUS(Details)

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PENSION AND OTHER POSTRETIREMENT BENEFITS - OBLIGATIONS, ASSETS AND FUNDED STATUS(Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
country
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Amounts recognized in consolidated balance sheets      
Pension assets - long-term $ 1,043 $ 731  
Pensions - long-term liabilities (330) (326)  
Postretirement benefits other than pensions-long-term liabilities (289) (329)  
Pension Plan      
Change in plan assets      
Exchange rate changes (30) 28 $ 7
Other Pension Plan      
Change in plan assets      
Employer contributions $ 11    
Less Significant Defined Benefit Plans Applicable to Number of Countries | country 14    
Maximum Percentage of Defined Benefit Plans Assets Included in Other Liabilities and Deferred Revenue 3.00%    
Maximum Percentage of Defined Benefit Plans, Obligations Included in Other Liabilities and Deferred Revenue 4.00%    
Other Postretirement Benefit Plan      
Change in benefit obligation      
Benefit obligation at the beginning of the year $ 364 385  
Interest cost 14 16 15
Plan participants' contributions 24 14  
Actuarial (gain) loss (35) 9  
Benefits paid directly by employer or from fund (49) (60)  
Benefit obligation at the end of the year $ 318 $ 364 385
Change in plan assets      
Less Significant Postretirement Benefit Plans Applicable To Number of Countries | country 4    
Maximum Percentage of Defined Benefit Plans, Obligations Included in Other Liabilities and Deferred Revenue 6.00% 5.00%  
Funded status      
Funded status at end of year $ (318) $ (364)  
Amounts recognized in consolidated balance sheets      
Accrued compensation, benefits and retirement costs - current liabilities (29) (35)  
Postretirement benefits other than pensions-long-term liabilities (289) (329)  
Net amount recognized (318) (364)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 27 69  
Prior service cost (4) (5)  
Net amount recognized 23 64  
UNITED STATES      
Change in plan assets      
Fair value of plan assets at the beginning of the year 2,751    
Fair value of plan assets at the end of the year 3,166 2,751  
UNITED STATES | Pension Plan      
Change in benefit obligation      
Benefit obligation at the beginning of the year 2,661 2,533  
Service cost 107 90 80
Interest cost 106 109 102
Actuarial (gain) loss 61 111  
Benefits paid directly by employer or from fund (155) (175)  
Plan amendments 0 9  
Benefit obligation at the end of the year 2,765 2,661 2,533
Change in plan assets      
Fair value of plan assets at the beginning of the year 2,751 2,636  
Actual return on plan assets 351 200  
Employer contributions 219 90  
Benefits paid from Fund (155) (175)  
Exchange rate changes 0 0  
Fair value of plan assets at the end of the year 3,166 2,751 2,636
Funded status      
Funded status at end of year 401 90  
Amounts recognized in consolidated balance sheets      
Pension assets - long-term 745 429  
Accrued compensation, benefits and retirement costs - current liabilities (14) (13)  
Pensions - long-term liabilities (330) (326)  
Net amount recognized 401 90  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 649 770  
Prior service cost 8 9  
Net amount recognized 657 779  
UNITED KINGDOM      
Change in plan assets      
Fair value of plan assets at the beginning of the year 1,753    
Fair value of plan assets at the end of the year 1,960 1,753  
UNITED KINGDOM | Pension Plan      
Change in benefit obligation      
Benefit obligation at the beginning of the year 1,451 1,390  
Service cost 26 21 27
Interest cost 40 50 56
Actuarial (gain) loss 53 316  
Benefits paid directly by employer or from fund (54) (55)  
Exchange rate changes 146 (271)  
Benefit obligation at the end of the year 1,662 1,451 1,390
Change in plan assets      
Fair value of plan assets at the beginning of the year 1,753 1,712  
Actual return on plan assets 78 402  
Employer contributions 9 28  
Benefits paid from Fund (54) (55)  
Exchange rate changes 174 (334)  
Fair value of plan assets at the end of the year 1,960 1,753 $ 1,712
Funded status      
Funded status at end of year 298 302  
Amounts recognized in consolidated balance sheets      
Pension assets - long-term 298 302  
Net amount recognized 298 302  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 207 172  
Net amount recognized 207 172  
Nonqualified Plan | UNITED STATES | Pension Plan      
Change in benefit obligation      
Benefits paid directly by employer or from fund $ (15) $ (16)