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Commitments and Contingencies (Schedule of Product Warranty Reserves) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 191 $ 187
Issuances/accruals during the period 134 149
Settlements made during the period (143) (151)
Balance at June 30 182 185
Current portion 143 143
Non-current portion 39 42
Total $ 182 $ 185