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Commitments: (Details 2) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Extended warranty
Jun. 30, 2013
Extended warranty
Movement in extended warranty liability        
Beginning balance, aggregate deferred revenue     $ 579 $ 606
Revenue deferred for new extended warranty contracts     132 119
Amortization of deferred revenue     (145) (148)
Other     (8) [1] (11) [1]
Ending balance, aggregate deferred revenue     558 567
Deferred revenue:        
Deferred income, current portion 12,591 12,557 266 271
Deferred income, noncurrent portion 4,152 4,108 292 296
Aggregate deferred revenue     $ 558 $ 567
[1]
Other primarily consists of foreign currency translation adjustments.