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Commitments: (Details 2) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Extended warranty
Sep. 30, 2011
Extended warranty
Movement in extended warranty liability        
Beginning balance, aggregate deferred revenue     $ 636 $ 670
Revenue deferred for new extended warranty contracts     191 225
Amortization of deferred revenue     (240) (256)
Other     0 (18)
Ending balance, aggregate deferred revenue     587 621
Deferred revenue:        
Deferred income, current portion 11,230 12,197 284 305
Deferred income, noncurrent portion 4,263 3,847 302 316
Aggregate deferred revenue     $ 587 $ 621