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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets $ 1,395 $ 1,501
Aggregate unpaid principal balance of assets for which fair value option was elected 1,678 1,804
Fair value option aggregate difference assets (283) (303)
Other assets    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 95 105
Aggregate unpaid principal balance of assets for which fair value option was elected 95 107
Fair value option aggregate difference assets (2)
Other borrowed funds    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value of liabilities for which fair value option was elected 31 30
Aggregate unpaid principal balance, other borrowed funds 32 30
Difference, Other borrowed funds (1)
Accruing loans less than 90 days past due | Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 441 487
Aggregate unpaid principal balance of assets for which fair value option was elected 452 498
Fair value option aggregate difference assets (11) (11)
Accruing loans 90 days or more past due | Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 225 262
Aggregate unpaid principal balance of assets for which fair value option was elected 238 278
Fair value option aggregate difference assets (13) (16)
Nonaccrual loans | Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 729 752
Aggregate unpaid principal balance of assets for which fair value option was elected 988 1,028
Fair value option aggregate difference assets (259) (276)
Residential mortgage loans held for sale | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 1,039 1,302
Aggregate unpaid principal balance of assets for which fair value option was elected 1,063 1,282
Fair value option aggregate difference assets (24) 20
Residential mortgage loans held for sale | Accruing loans less than 90 days past due | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 976 1,249
Aggregate unpaid principal balance of assets for which fair value option was elected 990 1,219
Fair value option aggregate difference assets (14) 30
Residential mortgage loans held for sale | Accruing loans 90 days or more past due | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 12 6
Aggregate unpaid principal balance of assets for which fair value option was elected 12 6
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 51 47
Aggregate unpaid principal balance of assets for which fair value option was elected 61 57
Fair value option aggregate difference assets (10) (10)
Commercial mortgage loans held for sale | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 307 575
Aggregate unpaid principal balance of assets for which fair value option was elected 331 580
Fair value option aggregate difference assets (24) (5)
Commercial mortgage loans held for sale | Accruing loans less than 90 days past due | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 307 575
Aggregate unpaid principal balance of assets for which fair value option was elected 331 580
Fair value option aggregate difference assets $ (24) $ (5)