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Financial Instruments (Cash flow hedges) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Summary Of Cash Flow Hedge Activity [Line Items]        
Maximum term of hedged forecasted transactions     17 years 18 years
Cash Flow Hedge        
Summary Of Cash Flow Hedge Activity [Line Items]        
Gain (loss) recognized in AOCI $ (124) $ (310) $ (761) $ (345)
Gain (loss) reclassified from AOCI into earnings (109) (414) (691) (596)
Pre-tax gain (loss) included in AOCI related to cash flow hedges of forecasted transactions     173  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     (167)  
Cash Flow Hedge | Interest Rate Contract        
Summary Of Cash Flow Hedge Activity [Line Items]        
Gain (loss) recognized in AOCI 10 9 0 0
Gain (loss) reclassified from AOCI into earnings (39) (53) (100) (182)
Cash Flow Hedge | Foreign Exchange Contract        
Summary Of Cash Flow Hedge Activity [Line Items]        
Gain (loss) recognized in AOCI (132) (318) (757) (343)
Gain (loss) reclassified from AOCI into earnings (69) (361) (589) (412)
Cash Flow Hedge | Commodity Contract        
Summary Of Cash Flow Hedge Activity [Line Items]        
Gain (loss) recognized in AOCI (2) (1) (4) (2)
Gain (loss) reclassified from AOCI into earnings $ (1) $ 0 $ (2) $ (2)