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Financial Instruments (Narratives) (Details 4) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Financial Instruments    
Fair value of derivative instruments in net asset position $ 994 $ 1,432
Warrants    
Derivative Instruments, Gain (Loss)    
Notional amount 0 0
Derivative instruments in fair value hedging relationships | Interest rate swaps    
Derivative Instruments, Gain (Loss)    
Notional amount $ 7,338 $ 5,839
Average remaining maturity 7 years 2 months 8 years 8 months
Derivative instruments in cash flow hedging relationships | Interest rate swaps    
Derivative Instruments, Gain (Loss)    
Notional amount $ 0 $ 0
Derivative instruments in cash flow hedging relationships | Interest rate swaps | Maximum    
Derivative Instruments, Gain (Loss)    
Net gains (losses) before taxes in other comprehensive income/(loss), cash flow hedges of borrowings 1 1
Gains (losses) expected to be reclassified to net income within the next 12 months 1 1
Derivative instruments in cash flow hedging relationships | Foreign exchange forward contracts    
Derivative Instruments, Gain (Loss)    
Notional amount $ 8,200 $ 9,300
Average remaining maturity 8 months 12 days 8 months 12 days
Net gains (losses) before taxes in other comprehensive income/(loss), cash flow hedges of borrowings $ 147 $ 602
Gains (losses) expected to be reclassified to net income within the next 12 months $ 121 572
Maximum length of time hedged 4 years  
Derivative instruments in cash flow hedging relationships | Currency swaps    
Derivative Instruments, Gain (Loss)    
Notional amount $ 0 0
Net gains (losses) before taxes in other comprehensive income/(loss), cash flow hedges of borrowings $ (2) (2)
Maximum length of time hedged 7 years  
Derivative instruments in cash flow hedging relationships | Currency swaps | Maximum    
Derivative Instruments, Gain (Loss)    
Gains (losses) expected to be reclassified to net income within the next 12 months $ (1) (1)
Derivative instruments in net investment hedging relationships    
Derivative Instruments, Gain (Loss)    
Notional amount $ 5,500 $ 2,200
Average remaining maturity 2 months 12 days 2 months 12 days
Derivative instruments not designated as hedging instruments | Foreign exchange forward and swap contracts    
Derivative Instruments, Gain (Loss)    
Notional amount $ 11,700 $ 13,100
Maximum length of time hedged 1 year  
Derivative instruments not designated as hedging instruments | Equity options | Maximum    
Derivative Instruments, Gain (Loss)    
Notional amount $ 100 100
Derivative instruments not designated as hedging instruments | Equity contracts    
Derivative Instruments, Gain (Loss)    
Notional amount 1,200 1,300
Derivative instruments not designated as hedging instruments | Credit default swaps    
Derivative Instruments, Gain (Loss)    
Notional amount $ 0 $ 0
Maximum length of time hedged 1 year