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Fair Value Option - Summary of Fair Value and Unpaid Principal Balance (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Loans Receivable [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Commercial loans held for sale, Fair Value $ 471 $ 725
Commercial loans held for sale, Unpaid Principal Balance 483 728
Fair value over (under) unpaid principal balance (12) (3)
Securities purchased under resale agreements [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value over (under) unpaid principal balance 0 3
Securities purchased under resale agreements, Fair Value 80 770
Securities purchased under resale agreements Unpaid Principal Balance 80 767
Securities sold under repurchase agreements [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value over (under) unpaid principal balance 1 2
Securities sold under repurchase agreements, Fair Value 2,032 2,672
Securities sold under repurchase agreements, Unpaid Principal Balance 2,031 2,670
Long-term debt [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value over (under) unpaid principal balance 480 262
Fixed rate long-term debt, Fair Value 2,230 2,012
Fixed rate long-term debt, Unpaid Principal Balance 1,750 1,750
Long-term debt [Member] | Structured Notes [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value over (under) unpaid principal balance 1,126 305
Hybrid instruments, Unpaid Principal Balance 9,530 8,067
Hybrid instruments, structured notes, Fair Value 10,656 8,372
Structured Deposits [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value over (under) unpaid principal balance 8 (355)
Hybrid instruments, structured deposits, Fair Value 7,693 7,526
Hybrid instruments, Unpaid Principal Balance $ 7,685 $ 7,881