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Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt securities available-for-sale |  |
Amortized Cost | $ 9,145 |
Fair Value | 9,145 | $ 9,060
Equity securities: |  |
Fair Value | 14 | 14
Total Securities |  |
Amortized Cost | 9,958 | 9,933
Gross Unrealized Gain | 62 | 14
Gross Unrealized Loss | 861 | 873
Total securities | 9,159 | 9,074
Interest receivable | $ 38 | 31
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets |
Mortgage Backed Securities And Other Securities |  |
Debt securities available-for-sale |  |
Amortized Cost | $ 9,942 | 9,917
Gross Unrealized Gain | 62 | 14
Gross Unrealized Loss | 859 | 871
Fair Value | 9,145 | 9,060
Mortgage- Related Securities |  |
Debt securities available-for-sale |  |
Amortized Cost | 7,035 | 5,242
Gross Unrealized Gain | 56 | 7
Gross Unrealized Loss | 528 | 460
Fair Value | 6,563 | 4,789
GSE certificates |  |
Debt securities available-for-sale |  |
Amortized Cost | 1,366 | 1,457
Gross Unrealized Gain | 1 | 0
Gross Unrealized Loss | 146 | 160
Fair Value | 1,221 | 1,297
GSE CMOs |  |
Debt securities available-for-sale |  |
Amortized Cost | 5,495 | 3,600
Gross Unrealized Gain | 48 | 1
Gross Unrealized Loss | 381 | 300
Fair Value | 5,162 | 3,301
Private Label CMOs |  |
Debt securities available-for-sale |  |
Amortized Cost | 174 | 185
Gross Unrealized Gain | 7 | 6
Gross Unrealized Loss | 1 | 0
Fair Value | 180 | 191
Debt Securities |  |
Debt securities available-for-sale |  |
Amortized Cost | 2,907 | 4,675
Gross Unrealized Gain | 6 | 7
Gross Unrealized Loss | 331 | 411
Fair Value | 2,582 | 4,271
U. S. Treasury obligations |  |
Debt securities available-for-sale |  |
Amortized Cost | 198 | 1,491
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 4
Fair Value | 198 | 1,487
GSE debentures |  |
Debt securities available-for-sale |  |
Amortized Cost | 1,899 | 1,749
Gross Unrealized Gain | 1 | 0
Gross Unrealized Loss | 291 | 351
Fair Value | 1,609 | 1,398
Asset-backed securities |  |
Debt securities available-for-sale |  |
Amortized Cost | 307 | 375
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 5 | 14
Fair Value | 302 | 361
Municipal bonds |  |
Debt securities available-for-sale |  |
Amortized Cost | 6 | 30
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 6 | 30
Corporate bonds |  |
Debt securities available-for-sale |  |
Amortized Cost | 365 | 913
Gross Unrealized Gain | 0 | 2
Gross Unrealized Loss | 22 | 30
Fair Value | 343 | 885
Foreign notes |  |
Debt securities available-for-sale |  |
Amortized Cost | 35 | 20
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 1 | 0
Fair Value | 34 | 20
Capital trust notes |  |
Debt securities available-for-sale |  |
Amortized Cost | 97 | 97
Gross Unrealized Gain | 5 | 5
Gross Unrealized Loss | 12 | 12
Fair Value | 90 | 90
Equity Securities |  |
Equity securities: |  |
Amortized Cost | 16 | 16
Gross Unrealized Loss | 2 |
Fair Value | 14 | 14
Total Securities |  |
Gross Unrealized Loss |  | 2
Mutual funds |  |
Equity securities: |  |
Amortized Cost | 16 | 16
Gross Unrealized Loss | 2 |
Fair Value | $ 14 | 14
Total Securities |  |
Gross Unrealized Loss |  | $ 2

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