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Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value $ 2,588 $ 1,095
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 76 10
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 827 726
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 28 20
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 3,415 1,821
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 104 30
Debt Securities | U.S. Treasury Obligations    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 45  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 45  
Debt Securities | U.S. Government and GSE obligations    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value   59
Temporarily Impaired Available-for-Sale Securities, Total Fair Value   59
Debt Securities | GSE Certificates    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 497 442
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 15 3
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value   74
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 497 516
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 15 3
Debt Securities | GSE CMOs    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 969 522
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 35 4
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 969 522
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 35 4
Debt Securities | GSE Debentures    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 927  
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss 26  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 393  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 17  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 1,320  
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 43  
Debt Securities | Asset-backed Securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 138  
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 141 364
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 2 6
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 279 364
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 2 6
Debt Securities | Municipal Bonds    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 8 9
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 8 9
Debt Securities | Corporate Bonds    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value   72
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss   3
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 249 246
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 1 3
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 249 318
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 1 6
Debt Securities | Capital Trust Notes    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value 36 33
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss 8 11
Temporarily Impaired Available-for-Sale Securities, Total Fair Value 36 33
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss 8 $ 11
Equity Securities    
Schedule of Investments [Line Items]    
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value 12  
Temporarily Impaired Available-for-Sale Securities, Total Fair Value $ 12