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Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities available-for-sale |  |
Amortized Cost | $ 10,511 |
Equity securities: |  |
Fair Value | 14 | $ 14
Total Securities |  |
Amortized Cost | 11,172 | 9,958
Gross Unrealized Gain | 87 | 62
Gross Unrealized Loss | 734 | 861
Fair Value | 10,525 | 9,159
Amortized cost of investment securities | 3 |
Interest receivable | $ 35 | $ 38
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets
Mortgage Backed Securities And Other Securities |  |
Debt securities available-for-sale |  |
Amortized Cost | $ 11,156 | $ 9,942
Gross Unrealized Gain | 87 | 62
Gross Unrealized Loss | 732 | 859
Fair Value | 10,511 | 9,145
Mortgage-Related Debt Securities: |  |
Debt securities available-for-sale |  |
Amortized Cost | 8,908 | 7,035
Gross Unrealized Gain | 81 | 56
Gross Unrealized Loss | 464 | 528
Fair Value | 8,525 | 6,563
GSE certificates |  |
Debt securities available-for-sale |  |
Amortized Cost | 1,296 | 1,366
Gross Unrealized Gain | 2 | 1
Gross Unrealized Loss | 123 | 146
Fair Value | 1,175 | 1,221
GSE collateralized mortgage obligations |  |
Debt securities available-for-sale |  |
Amortized Cost | 7,452 | 5,495
Gross Unrealized Gain | 67 | 48
Gross Unrealized Loss | 341 | 381
Fair Value | 7,178 | 5,162
Private label collateralized mortgage obligations |  |
Debt securities available-for-sale |  |
Amortized Cost | 160 | 174
Gross Unrealized Gain | 12 | 7
Gross Unrealized Loss | 0 | 1
Fair Value | 172 | 180
Other Debt Securities: |  |
Debt securities available-for-sale |  |
Amortized Cost | 2,248 | 2,907
Gross Unrealized Gain | 6 | 6
Gross Unrealized Loss | 268 | 331
Fair Value | 1,986 | 2,582
U. S. Treasury obligations |  |
Debt securities available-for-sale |  |
Amortized Cost |  | 198
Gross Unrealized Gain |  | 0
Gross Unrealized Loss |  | 0
Fair Value |  | 198
GSE debentures |  |
Debt securities available-for-sale |  |
Amortized Cost | 1,502 | 1,899
Gross Unrealized Gain | 0 | 1
Gross Unrealized Loss | 248 | 291
Fair Value | 1,254 | 1,609
Asset-backed securities |  |
Debt securities available-for-sale |  |
Amortized Cost | 246 | 307
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 3 | 5
Fair Value | 243 | 302
Municipal bonds |  |
Debt securities available-for-sale |  |
Amortized Cost | 6 | 6
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 0
Fair Value | 6 | 6
Corporate bonds |  |
Debt securities available-for-sale |  |
Amortized Cost | 364 | 365
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 7 | 22
Fair Value | 357 | 343
Foreign notes |  |
Debt securities available-for-sale |  |
Amortized Cost | 35 | 35
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 0 | 1
Fair Value | 35 | 34
Capital trust notes |  |
Debt securities available-for-sale |  |
Amortized Cost | 95 | 97
Gross Unrealized Gain | 6 | 5
Gross Unrealized Loss | 10 | 12
Fair Value | 91 | 90
Equity securities: |  |
Equity securities: |  |
Amortized Cost | 16 | 16
Gross Unrealized Loss | 2 | 2
Fair Value | 14 | 14
Mutual funds |  |
Equity securities: |  |
Amortized Cost | 16 | 16
Gross Unrealized Loss | 2 | 2
Fair Value | $ 14 | $ 14

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