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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Loans Held For Sale | Residential Mortgages    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets $ 1,302 $ 855
Aggregate Unpaid Principal Balance - Assets 1,282 821
Difference - Assets 20 34
Loans Held For Sale | Commercial Mortgage    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 575 362
Aggregate Unpaid Principal Balance - Assets 580 376
Difference - Assets (5) (14)
Loans Held For Sale | Accruing loans less than 90 days past due | Residential Mortgages    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 1,249 831
Aggregate Unpaid Principal Balance - Assets 1,219 793
Difference - Assets 30 38
Loans Held For Sale | Accruing loans less than 90 days past due | Commercial Mortgage    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 575 357
Aggregate Unpaid Principal Balance - Assets 580 370
Difference - Assets (5) (13)
Loans Held For Sale | Accruing loans 90 days or more past due | Residential Mortgages    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 6 4
Aggregate Unpaid Principal Balance - Assets 6 4
Loans Held For Sale | Nonaccrual loans | Residential Mortgages    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 47 20
Aggregate Unpaid Principal Balance - Assets 57 24
Difference - Assets (10) (4)
Loans Held For Sale | Nonaccrual loans | Commercial Mortgage    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets   5
Aggregate Unpaid Principal Balance - Assets   6
Difference - Assets (1)
Loans | Residential Mortgages    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 1,501 1,365
Aggregate Unpaid Principal Balance - Assets 1,804 1,645
Difference - Assets (303) (280)
Loans | Accruing loans less than 90 days past due | Residential Mortgages    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 487 519
Aggregate Unpaid Principal Balance - Assets 498 530
Difference - Assets (11) (11)
Loans | Accruing loans 90 days or more past due | Residential Mortgages    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 262 283
Aggregate Unpaid Principal Balance - Assets 278 295
Difference - Assets (16) (12)
Loans | Nonaccrual loans | Residential Mortgages    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 752 563
Aggregate Unpaid Principal Balance - Assets 1,028 820
Difference - Assets (276) (257)
Other assets    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Assets 105 81
Aggregate Unpaid Principal Balance - Assets 107 69
Difference - Assets (2) 12
Other borrowed funds    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value - Liabilities 30 32
Aggregate Unpaid Principal Balance - Liabilities 30 33
Difference - Liabilities $ (1)