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Fair Value Option - Summary of Fair Value and Unpaid Principal Balance (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Loans Receivable [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Commercial loans held for sale, Fair Value $ 315 $ 384
Commercial loans held for sale, Unpaid Principal Balance 325 390
Short-term Borrowings [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Repurchase agreements, Fair Value 2,070 0
Repurchase agreements, Unpaid Principal Balance 2,068  
Long-term debt [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fixed rate long-term debt, Fair Value 2,011 2,179
Fixed rate long-term debt, Unpaid Principal Balance 1,750 1,750
Hybrid Instruments, Fair Value 6,890 6,612
Hybrid Instruments, Unpaid Principal Balance 6,735 6,275
Deposits [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Hybrid Instruments, Fair Value 6,632 7,346
Hybrid Instruments, Unpaid Principal Balance $ 6,563 $ 7,176