Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES REVENUE RECOGNITION SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

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REVENUE RECOGNITION SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES REVENUE RECOGNITION SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Contract with Customer, Asset and Liability The following is a summary of our unbilled and deferred revenue and related activity:
In millions
 
September 30,
2018
 
January 1,
2018
Unbilled revenue
 
$
56

 
$
6

Deferred revenue, primarily extended warranty
 
1,137

 
1,052

Revenue recognized (1)
 
(277
)
 
—

____________________________________
(1) Relates to year-to-date revenues recognized from amounts included in deferred revenue at the beginning of the year.
Revenue recognized in the period from performance obligations satisfied in previous periods was immaterial.