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Warranty and Deferred Extended Warranty Revenue (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
May 03, 2013
May 04, 2012
Warranty liability:    
Warranty liability at beginning of period $ 762 $ 888
Costs accrued for new warranty contracts and changes in estimates for pre-existing warranties 242 283
Service obligations honored (244) (309)
Warranty liability at end of period 760 862
Current portion 490 558
Non-current portion 270 304
Warranty liability at end of period 760 862
Deferred extended warranty revenue:    
Deferred extended warranty revenue at beginning of period 7,048 7,002
Revenue deferred for new extended warranties 959 1,006
Revenue Recognized (1,025) (964)
Deferred extended warranty revenue at end of period 6,982 7,044
Current portion 3,337 3,308
Non-current portion 3,645 3,736
Deferred extended warranty revenue at end of period $ 6,982 $ 7,044