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Commitments and Contingencies (Schedule of Product Warranty Reserves) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 191 $ 187
Issuances/accruals during the period 63 84
Settlements made during the period (74) (89)
Balance at March 31 180 182
Current portion 143 143
Non-current portion 37 39
Total $ 180 $ 182