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Commitments and Guarantees (Product Warranties) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Product Warranties      
Beginning Balance $ 1,370 $ 1,429 $ 1,553
Current-year provisions 593 798 645
Expenditures (714) (867) (757)
Other changes (50) 10 (12)
Ending Balance $ 1,199 $ 1,370 $ 1,429