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Fair Value (Fair Value Option for Certain Assets and Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Option, Quantitative Disclosures [Line Items]    
Carrying value at estimated fair value $ 76,541 $ 74,545
Consolidated Securitization Entities    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance 81 88
Difference between estimated fair value and unpaid principal balance 48 48
Carrying value at estimated fair value 129 136
Loans in nonaccrual status 0 0
Fair Value, Option, Loans more than 90 days past due 0 0
Fair Value, Option, Loans in nonaccrual status or more than 90 days past due, or both 0 0
Residential mortgage loans — FVO    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance 883 794
Difference between estimated fair value and unpaid principal balance (244) (228)
Carrying value at estimated fair value 639 566
Loans in nonaccrual status 232 214
Fair Value, Option, Loans more than 90 days past due 144 137
Fair Value, Option, Loans in nonaccrual status or more than 90 days past due, or both $ (162) $ (150)