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Long-Term Debt (Long-Term Debt Portfolio) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities $ 13,413 $ 17,438
Long-term Debt, Excluding Current Maturities 53,603 48,668
Derivative, Amount of Hedged Item 445 452
Long-term debt 67,461 66,558
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities 1,848 4,809
Long-term Debt, Excluding Current Maturities 17,407 17,154
Derivative, Amount of Hedged Item 445 452
Long-term debt 19,700 22,415
Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities 11,565 12,629
Long-term Debt, Excluding Current Maturities 36,196 31,514
Derivative, Amount of Hedged Item 0 0
Long-term debt 47,761 44,143
Trust Preferred Securities Subject to Mandatory Redemption [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Excluding Current Maturities 2,600 2,600
Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 6,400 $ 2,800