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Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | $ 7,599 |
Marketable securities amortized cost | 8,392 | $ 9,933
Marketable securities gross unrealized gain | 18 | 14
Marketable securities gross unrealized loss | 797 | 873
Debt securities, available-for-sale | 7,599 | 9,060
Equity investments with readily determinable fair values, at fair value | 14 | 14
Total securities | 7,613 | 9,074
Interest receivable | 30 | 31
Agency - commercial |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 5,133 | 5,242
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 11 | 7
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (428) | (460)
Debt securities, available-for-sale | 4,716 | 4,789
Debt Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 3,243 | 4,675
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 7 | 7
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (367) | (411)
Debt securities, available-for-sale | 2,883 | 4,271
Mortgage Backed Securities And Other Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 8,376 | 9,917
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 18 | 14
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (795) | (871)
Debt securities, available-for-sale | 7,599 | 9,060
Equity Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Equity securities, FV-NI, cost | 16 | 16
Equity securities, FV-NI, unrealized loss | 2 | 2
Equity investments with readily determinable fair values, at fair value | 14 | 14
GSE certificates | Agency - commercial |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 1,388 | 1,457
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 1 | 0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (143) | (160)
Debt securities, available-for-sale | 1,246 | 1,297
GSE CMOs | Agency - commercial |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 3,562 | 3,600
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 4 | 1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (284) | (300)
Debt securities, available-for-sale | 3,282 | 3,301
Private Label CMOs | Agency - commercial |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 183 | 185
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 6 | 6
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (1) | 0
Debt securities, available-for-sale | 188 | 191
U. S. Treasury obligations | Debt Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 0 | 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 | 0 | 1,487
GSE debentures | Debt Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 1,899 | 1,749
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 0 | 0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (310) | (351)
Debt securities, available-for-sale | 1,589 | 1,398
Asset-backed securities | Debt Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 345 | 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 | (10) | (14)
Debt securities, available-for-sale | 335 | 361
Municipal bonds | Debt Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 18 | 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 | 0 | 0
Debt securities, available-for-sale | 18 | 30
Corporate bonds | Debt Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 864 | 913
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 2 | 2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | (33) | (30)
Debt securities, available-for-sale | 833 | 885
Foreign notes | Debt Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Debt securities, available-for-sale, amortized cost, total | 20 | 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 | (1) | 0
Debt securities, available-for-sale | 19 | 20
Capital trust notes | Debt Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
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 | (13) | (12)
Debt securities, available-for-sale | 89 | 90
Mutual funds and common stock | Equity Securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Equity securities, FV-NI, cost | 16 | 16
Equity securities, FV-NI, unrealized loss | 2 | 2
Equity investments with readily determinable fair values, at fair value | $ 14 | $ 14

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