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Long-Term Debt (Long-Term Debt Portfolio) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities $ 13,868 $ 11,256
Long-term Debt, Excluding Current Maturities 47,669 54,647
Derivative, Amount of Hedged Item 507 331
Long-term debt 62,044 66,234
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities 4,351 1,829
Long-term Debt, Excluding Current Maturities 15,758 18,803
Derivative, Amount of Hedged Item 497 334
Long-term debt 20,606 20,966
Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities 9,517 9,427
Long-term Debt, Excluding Current Maturities 31,911 35,844
Derivative, Amount of Hedged Item 10 (3)
Long-term debt 41,438 45,268
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 $ 5,400 $ 5,400