Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS - LEVEL 3 FAIR VALUE RECONCILIATION (Details 5)

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PENSION AND OTHER POSTRETIREMENT BENEFITS - LEVEL 3 FAIR VALUE RECONCILIATION (Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
UNITED STATES      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets $ 3,166 $ 2,751  
UNITED STATES | Fair Value, Inputs, Level 3      
Summary of changes in the fair value of level 3 assets      
Unrealized (losses) gains on assets still held at the reporting date 29 12  
Purchases, sales and settlements, net 5 (3)  
Fair value of plan assets 246 212 $ 203
UNITED STATES | Fair Value, Inputs, Level 3 | Private equity / venture capital      
Summary of changes in the fair value of level 3 assets      
Unrealized (losses) gains on assets still held at the reporting date 24 6  
Purchases, sales and settlements, net 8 (1)  
Fair value of plan assets 180 148 143
UNITED STATES | Fair Value, Inputs, Level 3 | Real estate      
Summary of changes in the fair value of level 3 assets      
Unrealized (losses) gains on assets still held at the reporting date 5 6  
Purchases, sales and settlements, net (3) (2)  
Fair value of plan assets 66 64 60
UNITED KINGDOM      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets 1,960 1,753  
UNITED KINGDOM | Fair Value, Inputs, Level 3      
Summary of changes in the fair value of level 3 assets      
Unrealized (losses) gains on assets still held at the reporting date 76 2  
Purchases, sales and settlements, net (18) 10  
Fair value of plan assets 671 613 601
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Private equity / venture capital      
Summary of changes in the fair value of level 3 assets      
Unrealized (losses) gains on assets still held at the reporting date 28 15  
Purchases, sales and settlements, net (10) 3  
Fair value of plan assets 135 117 99
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Real estate      
Summary of changes in the fair value of level 3 assets      
Unrealized (losses) gains on assets still held at the reporting date 10 (7)  
Purchases, sales and settlements, net (8) 7  
Fair value of plan assets 59 57 57
UNITED KINGDOM | Fair Value, Inputs, Level 3 | Insurance      
Summary of changes in the fair value of level 3 assets      
Unrealized (losses) gains on assets still held at the reporting date 38 (6)  
Purchases, sales and settlements, net 0 0  
Fair value of plan assets $ 477 $ 439 $ 445