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Commitments and Contingencies (Schedule of Product Warranty and Recall Reserves) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 187 $ 191
Issuances/accruals during the period 241 233
Settlements made during the period (236) (241)
Other changes 0 0
Balance at September 30 192 183
Current portion 147 150
Non-current portion 45 33
Total $ 192 $ 183