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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets $ 1,609 $ 1,365
Aggregate unpaid principal balance of assets for which fair value option was elected 1,918 1,645
Fair value option aggregate difference assets (309) (280)
Other assets    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 96 81
Aggregate unpaid principal balance of assets for which fair value option was elected 93 69
Fair value option aggregate difference assets 3 12
Other borrowed funds    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value of liabilities for which fair value option was elected 31 32
Aggregate unpaid principal balance, other borrowed funds 31 33
Difference, Other borrowed funds   (1)
Accruing loans less than 90 days past due | Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 652 519
Aggregate unpaid principal balance of assets for which fair value option was elected 669 530
Fair value option aggregate difference assets (17) (11)
Accruing loans 90 days or more past due | Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 260 283
Aggregate unpaid principal balance of assets for which fair value option was elected 278 295
Fair value option aggregate difference assets (18) (12)
Nonaccrual loans | Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 697 563
Aggregate unpaid principal balance of assets for which fair value option was elected 971 820
Fair value option aggregate difference assets (274) (257)
Residential mortgage loans held for sale | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 1,519 855
Aggregate unpaid principal balance of assets for which fair value option was elected 1,485 821
Fair value option aggregate difference assets 34 34
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 1,465 831
Aggregate unpaid principal balance of assets for which fair value option was elected 1,422 793
Fair value option aggregate difference assets 43 38
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 4 4
Aggregate unpaid principal balance of assets for which fair value option was elected 4 4
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 50 20
Aggregate unpaid principal balance of assets for which fair value option was elected 59 24
Fair value option aggregate difference assets (9) (4)
Commercial real estate | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 508 362
Aggregate unpaid principal balance of assets for which fair value option was elected 520 376
Fair value option aggregate difference assets (12) (14)
Commercial real estate | Accruing loans less than 90 days past due | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets 508 357
Aggregate unpaid principal balance of assets for which fair value option was elected 520 370
Fair value option aggregate difference assets (12) (13)
Commercial real estate | Nonaccrual loans | Loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value - assets   5
Aggregate unpaid principal balance of assets for which fair value option was elected   6
Fair value option aggregate difference assets $ (1)