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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Other Assets Fair Value [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets $ 60 $ 132
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 61 125
Fair Value Option Aggregate Difference Assets (1) 7
Other Borrowed Funds [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of liabilities for which fair value option was elected 28 63
Aggregate Unpaid Principal Balance, Other borrowed funds 28 64
Difference, Other borrowed funds (1)
Residential Mortgage [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 660 819
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 633 798
Fair Value Option Aggregate Difference Assets 27 21
Residential Mortgage [Member] | Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 1,301 742
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 1,591 865
Fair Value Option Aggregate Difference Assets (290) (123)
Residential Mortgage [Member] | Loans Less Than 90 Days Past Due [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 642 813
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 613 792
Fair Value Option Aggregate Difference Assets 29 21
Residential Mortgage [Member] | Loans Less Than 90 Days Past Due [Member] | Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 491 291
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 504 304
Fair Value Option Aggregate Difference Assets (13) (13)
Residential Mortgage [Member] | Loans 90 Days Or More Past Due [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 3 2
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 3 2
Residential Mortgage [Member] | Loans 90 Days Or More Past Due [Member] | Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 247 285
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 259 296
Fair Value Option Aggregate Difference Assets (12) (11)
Residential Mortgage [Member] | Nonaccrual Loans [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 15 4
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 17 4
Fair Value Option Aggregate Difference Assets (2)
Residential Mortgage [Member] | Nonaccrual Loans [Member] | Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 563 166
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 828 265
Fair Value Option Aggregate Difference Assets (265) (99)
Commercial Mortgage [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 706 246
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 700 265
Fair Value Option Aggregate Difference Assets 6 (19)
Commercial Mortgage [Member] | Loans Less Than 90 Days Past Due [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 706 245
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 700 263
Fair Value Option Aggregate Difference Assets 6 (18)
Commercial Mortgage [Member] | Nonaccrual Loans [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets   1
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected   2
Fair Value Option Aggregate Difference Assets $ (1)