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Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | $ 8,723 |
Debt securities, available-for-sale | 8,723 | $ 9,060
Equity securities: |  |
Equity securities, Fair Value | 13 | 14
Interest receivable | 39 | 31
Marketable securities amortized cost | 9,917 | 9,933
Marketable securities gross unrealized gain | 9 | 14
Marketable securities gross unrealized loss | 1,190 | 873
Total securities | 8,736 | 9,074
Agency - commercial |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 6,438 | 5,242
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 7
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 749 | 460
Debt securities, available-for-sale | 5,689 | 4,789
Debt Securities |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 3,463 | 4,675
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 9 | 7
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 438 | 411
Debt securities, available-for-sale | 3,034 | 4,271
Mortgage Backed Securities And Other Securities |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 9,901 | 9,917
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 9 | 14
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1,187 | 871
Debt securities, available-for-sale | 8,723 | 9,060
Equity Securities |  |
Equity securities: |  |
Equity securities, Fair Value | 13 | 14
Equity securities, Amortized Cost | 16 | 16
Equity securities, Gross Unrealized Loss | 3 | 2
GSE certificates | Agency - commercial |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 1,378 | 1,457
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 214 | 160
Debt securities, available-for-sale | 1,164 | 1,297
GSE CMOs | Agency - commercial |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 4,883 | 3,600
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 532 | 300
Debt securities, available-for-sale | 4,351 | 3,301
Private Label CMOs |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale | 174 |
Private Label CMOs | Agency - commercial |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 177 | 185
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 6
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 3 | 0
Debt securities, available-for-sale | 174 | 191
U. S. Treasury obligations | Debt Securities |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 195 | 1,491
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 0 | 4
Debt securities, available-for-sale | 195 | 1,487
GSE debentures | Debt Securities |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 2,041 | 1,749
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 1 | 0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 383 | 351
Debt securities, available-for-sale | 1,659 | 1,398
Asset-backed securities | Debt Securities |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 319 | 375
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 6 | 14
Debt securities, available-for-sale | 313 | 361
Municipal bonds | Debt Securities |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 7 | 30
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1 | 0
Debt securities, available-for-sale | 6 | 30
Corporate bonds | Debt Securities |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 769 | 913
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 3 | 2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 35 | 30
Debt securities, available-for-sale | 737 | 885
Foreign notes | Debt Securities |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 35 | 20
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 2 | 0
Debt securities, available-for-sale | 33 | 20
Capital trust notes | Debt Securities |  |
Debt securities available-for-sale |  |
Debt securities, available-for-sale, amortized cost, total | 97 | 97
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 5 | 5
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 11 | 12
Debt securities, available-for-sale | 91 | 90
Mutual funds and common stock | Equity Securities |  |
Equity securities: |  |
Equity securities, Fair Value | 13 | 14
Equity securities, Amortized Cost | 16 | 16
Equity securities, Gross Unrealized Loss | $ 3 | $ 2

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