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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Other Assets Fair Value [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets $ 62 $ 132
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 59 125
Fair Value Option Aggregate Difference Assets 3 7
Other Borrowed Funds [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value of liabilities for which fair value option was elected 29 63
Aggregate Unpaid Principal Balance, Other borrowed funds 29 64
Difference, Other borrowed funds (1)
Residential Mortgage [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 831 819
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 797 798
Fair Value Option Aggregate Difference Assets 34 21
Residential Mortgage [Member] | Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 1,031 742
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 1,325 865
Fair Value Option Aggregate Difference Assets (294) (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 813 813
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 778 792
Fair Value Option Aggregate Difference Assets 35 21
Residential Mortgage [Member] | Loans Less Than 90 Days Past Due [Member] | Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 273 291
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 287 304
Fair Value Option Aggregate Difference Assets (14) (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 7 2
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 7 2
Residential Mortgage [Member] | Loans 90 Days Or More Past Due [Member] | Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 233 285
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 244 296
Fair Value Option Aggregate Difference Assets (11) (11)
Residential Mortgage [Member] | Nonaccrual Loans [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 11 4
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 12 4
Fair Value Option Aggregate Difference Assets (1)
Residential Mortgage [Member] | Nonaccrual Loans [Member] | Loans [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 525 166
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 794 265
Fair Value Option Aggregate Difference Assets (269) (99)
Commercial Mortgage [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 404 246
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 417 265
Fair Value Option Aggregate Difference Assets (13) (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 403 245
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 416 263
Fair Value Option Aggregate Difference Assets (13) (18)
Commercial Mortgage [Member] | Nonaccrual Loans [Member] | Loans Held For Sale [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 1 1
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected 1 2
Fair Value Option Aggregate Difference Assets $ (1)