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Derivatives and Hedging Activities (Details Textuals) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivatives and Hedging Activities (Textuals) [Abstract]      
Net reduction in interest expense on long term debt and other $ 224 $ 284 $ 283
Margin on interest rate swap not netted 169 149  
Derivative [Line Items]      
Equity investment 49 49  
Total derivatives assets, net 555 282  
Derivative, Gain (Loss) on Derivative, Net   366 712
Other Expense [Member]      
Derivative [Line Items]      
Gain (Loss) in changes of Fair Value of Derivatives not designated as hedges 1 83 66
Gain on embedded derivatives 9 5 4
Fair Value Hedges [Member]      
Derivative [Line Items]      
Notional amount of long-term debt 17,700 18,800  
Cash Flow Hedges [Member]      
Derivative [Line Items]      
Notional amount of long-term debt   0  
Net Investment Hedges [Member]      
Derivative [Line Items]      
Effective portion of gain (loss) on hedges 281 577 455
Net Investment Hedges [Member] | Other Expense [Member]      
Derivative [Line Items]      
Amount Of Ineffectiveness On Net Investment Hedges 0 1 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 5 0 $ 10
Credit Valuation Adjustment [Member]      
Derivative [Line Items]      
Notional amount of long-term debt 0 0  
Not Sold Or Repledged [Member]      
Derivative [Line Items]      
Securities received as collateral 18 0  
Risk Exposure Low [Member]      
Derivative [Line Items]      
Total derivatives assets, net 537    
Significant Counterparties [Member]      
Derivative [Line Items]      
Total derivatives assets, net 0 $ 0  
Total derivatives liabilities, net $ 0