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Investment Securities - Schedule of Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Investment securities available for sale |  |
Investment securities available for sale, cost | $ 9,857 | $ 9,215
Investment securities available for sale, gross unrealized gains | 6 | 45
Investment securities available for sale, gross unrealized losses | (653) | (57)
Investment securities available for sale | 9,210 | 9,203
Investment in marketable equity securities |  |
Investment in marketable equity securities at cost | 73 | 73
Investment in marketable equity, gross unrealized gains | 21 | 25
Investment in marketable equity, gross unrealized losses | 0 | 0
Investment in marketable equity, fair value | 94 | 98
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 9,832 | 3,809
Investment securities held to maturity, gross unrealized gains | 0 | 6
Investment securities held to maturity, gross unrealized losses | (1,020) | (56)
Investment securities held to maturity, cost, fair value | 8,812 | 3,759
Total investment securities |  |
Total investment securities, amortized cost | 19,762 | 13,097
Total investment securities, gross unrealized gains | 27 | 76
Total investment securities, gross unrealized losses | (1,673) | (113)
Total investment securities, fair value | 18,116 | 13,060
U.S. Treasury |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 2,005 | 2,007
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | (102) | (2)
Investment securities available for sale | 1,903 | 2,005
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 472 |
Investment securities held to maturity, gross unrealized gains | 0 |
Investment securities held to maturity, gross unrealized losses | (35) |
Investment securities held to maturity, cost, fair value | 437 |
Government agency |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 191 | 221
Investment securities available for sale, gross unrealized gains | 1 | 1
Investment securities available for sale, gross unrealized losses | (2) | (1)
Investment securities available for sale | 190 | 221
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 1,544 |
Investment securities held to maturity, gross unrealized gains | 0 |
Investment securities held to maturity, gross unrealized losses | (120) |
Investment securities held to maturity, cost, fair value | 1,424 |
Residential mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 5,448 | 4,757
Investment securities available for sale, gross unrealized gains | 1 | 8
Investment securities available for sale, gross unrealized losses | (429) | (36)
Investment securities available for sale | 5,020 | 4,729
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 4,633 | 2,322
Investment securities held to maturity, gross unrealized gains | 0 | 6
Investment securities held to maturity, gross unrealized losses | (514) | (22)
Investment securities held to maturity, cost, fair value | 4,119 | 2,306
Commercial mortgage-backed securities |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 1,632 | 1,648
Investment securities available for sale, gross unrealized gains | 2 | 9
Investment securities available for sale, gross unrealized losses | (107) | (17)
Investment securities available for sale | 1,527 | 1,640
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 2,886 | 1,485
Investment securities held to maturity, gross unrealized gains | 0 | 0
Investment securities held to maturity, gross unrealized losses | (323) | (34)
Investment securities held to maturity, cost, fair value | 2,563 | 1,451
Corporate bonds |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 581 | 582
Investment securities available for sale, gross unrealized gains | 2 | 27
Investment securities available for sale, gross unrealized losses | (13) | (1)
Investment securities available for sale | 570 | 608
Supranational securities |  |
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 294 |
Investment securities held to maturity, gross unrealized gains | 0 |
Investment securities held to maturity, gross unrealized losses | (28) |
Investment securities held to maturity, cost, fair value | 266 |
Other |  |
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 3 | 2
Investment securities held to maturity, gross unrealized gains | 0 | 0
Investment securities held to maturity, gross unrealized losses | 0 | 0
Investment securities held to maturity, cost, fair value | $ 3 | $ 2

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