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Commitments: (Details 2) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Extended warranty
Sep. 30, 2013
Extended warranty
Movement in extended warranty liability        
Beginning balance, aggregate deferred revenue     $ 579 $ 606
Revenue deferred for new extended warranty contracts     195 204
Amortization of deferred revenue     (214) (244)
Other     (21) [1] (7) [1]
Ending balance, aggregate deferred revenue     539 559
Deferred revenue:        
Deferred income, current portion 11,346 12,557 257 283
Deferred income, noncurrent portion 3,683 4,108 282 276
Aggregate deferred revenue     $ 539 $ 559
[1]
Other primarily consists of foreign currency translation adjustments.