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Long-Term Debt (Long-Term Debt Portfolio) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities $ 14,859 $ 11,256
Long-term Debt, Excluding Current Maturities 45,644 54,647
Derivative, Amount of Hedged Item 537 331
Long-term debt 61,040 66,234
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities 4,363 1,829
Long-term Debt, Excluding Current Maturities 16,683 18,803
Derivative, Amount of Hedged Item 520 334
Long-term debt 21,566 20,966
Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities 10,496 9,427
Long-term Debt, Excluding Current Maturities 28,961 35,844
Derivative, Amount of Hedged Item 17 (3)
Long-term debt 39,474 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
Committed Funding Facilities [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 19,625 20,415
Committed Funding Facilities [Member] | Bank Funding Member | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 4,000 $ 3,250