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Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 6,689 $ 5,780
Equity Securities, Fair Value 14 16
Total Securities, Amortized Cost 7,543 [1] 5,850 [2]
Total Securities, Gross Unrealized Gain 8 [1] 62 [2]
Total Securities, Gross Unrealized Loss 848 [1] 116 [2]
Total Securities, Fair Value 6,703 [1] 5,796 [2]
Mortgage-Related Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,677 2,819
Gross Unrealized Gain   31
Gross Unrealized Loss 447 60
Fair Value 2,230 2,790
Mortgage-Related Securities | GSE Certificates    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,115 1,102
Gross Unrealized Gain   20
Gross Unrealized Loss 171 15
Fair Value 944 1,107
Mortgage-Related Securities | GSE CMOs    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,562 1,717
Gross Unrealized Gain   11
Gross Unrealized Loss 276 45
Fair Value 1,286 1,683
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,850 3,015
Gross Unrealized Gain 8 31
Gross Unrealized Loss 399 56
Fair Value 4,459 2,990
Debt Securities | U.S. Treasury Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,677 45
Gross Unrealized Loss 5  
Fair Value 1,672 45
Debt Securities | GSE Debentures    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,749 1,524
Gross Unrealized Gain   1
Gross Unrealized Loss 343 45
Fair Value 1,406 1,480
Debt Securities | Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 401 [3] 479 [4]
Gross Unrealized Gain [4]   3
Gross Unrealized Loss 10 [3] 3 [4]
Fair Value 391 [3] 479 [4]
Debt Securities | Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 884 821
Gross Unrealized Gain 2 18
Gross Unrealized Loss 31 1
Fair Value 855 838
Debt Securities | Municipal Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 18 25
Fair Value 18 25
Debt Securities | Foreign Notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 25 25
Gross Unrealized Gain   1
Fair Value 25 26
Debt Securities | Capital Trust Notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 96 96
Gross Unrealized Gain 6 8
Gross Unrealized Loss 10 7
Fair Value 92 97
Mortgage Backed Securities And Other Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,527 5,834
Gross Unrealized Gain 8 62
Gross Unrealized Loss 846 116
Fair Value 6,689 5,780
Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Equity Securities, Amortized Cost 16 16
Equity Securities, Gross Unrealized Loss 2  
Equity Securities, Fair Value 14 16
Equity Securities | Mutual Funds    
Schedule of Available-for-sale Securities [Line Items]    
Equity Securities, Amortized Cost 16 16
Equity Securities, Gross Unrealized Loss 2  
Equity Securities, Fair Value $ 14 $ 16
[1] Excludes accrued interest receivable of $23 million included in other assets in the Consolidated Statements of Condition.
[2] Excludes accrued interest receivable of $15 million included in other assets in the Consolidated Statements of Condition.
[3] The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.
[4] The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.