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Commitments and Contingencies (Schedule of Product Warranty and Recall Reserves) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Document Period End Date Mar. 31, 2013  
Balance at January 1 $ 187 $ 191
Issuances/accruals during the period 86 97
Settlements made during the period (89) (104)
Other changes (2) 0
Balance at March 31 182 184
Current portion 143 150
Non-current portion 39 34
Total $ 182 $ 184