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Fair Values (Hybrid Notes) (Details) - Designated as Hedging Instrument [Member] - Cash Flow Hedging [Member] - Foreign Currency Gain (Loss) [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Hybrid Instruments [Line Items]    
Hybrid Instruments at Fair Value, Net $ 1,200  
Other Comprehensive Income (Loss) [Member]    
Hybrid Instruments [Line Items]    
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax 49
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness $ 0