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Derivatives and Hedging Activities (Details Textuals) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivatives and Hedging Activities (Textuals) [Abstract]      
Net reduction in interest expense on long term debt and other $ 284 $ 283 $ 346
Margin on interest rate swap not netted 149 114  
Derivative [Line Items]      
Equity investment 1 1  
Total derivatives assets, net 282 711  
Not Sold Or Repledged [Member]      
Derivative [Line Items]      
Securities received as collateral 0 91  
Risk Exposure Low [Member]      
Derivative [Line Items]      
Total derivatives assets, net 0    
Significant Counterparties [Member]      
Derivative [Line Items]      
Total derivatives assets, net 0 0  
Total derivatives liabilities, net 0    
Fair Value Hedges [Member]      
Derivative [Line Items]      
Notional amount of long-term debt 18,800 17,600  
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 577 455 $ 253
Credit Valuation Adjustment [Member]      
Derivative [Line Items]      
Notional amount of long-term debt $ 0 $ 0