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Investment Securities - Schedule of Unrealized Losses (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Investment securities available for sale: |  |
Investment securities available for sale, less than 12 months, fair value | $ 1,687 | $ 3,501
Investment securities available for sale, less than 12 months, unrealized losses | (66) | (276)
Investment securities available for sale, 12 months or more, fair value | 7,062 | 5,347
Investment securities available for sale, 12 months or more, unrealized losses | (831) | (697)
Investment securities available for sale, fair value | 8,749 | 8,848
Investment securities available for sale, unrealized losses | (897) | (973)
Investment securities available for sale, allowance for credit loss | 4 |
U.S. Treasury |  |
Investment securities available for sale: |  |
Investment securities available for sale, less than 12 months, fair value | 28 | 403
Investment securities available for sale, less than 12 months, unrealized losses | (1) | (27)
Investment securities available for sale, 12 months or more, fair value | 1,889 | 1,495
Investment securities available for sale, 12 months or more, unrealized losses | (112) | (110)
Investment securities available for sale, fair value | 1,917 | 1,898
Investment securities available for sale, unrealized losses | (113) | (137)
Government agency |  |
Investment securities available for sale: |  |
Investment securities available for sale, less than 12 months, fair value | 75 | 65
Investment securities available for sale, less than 12 months, unrealized losses | (1) | (1)
Investment securities available for sale, 12 months or more, fair value | 75 | 62
Investment securities available for sale, 12 months or more, unrealized losses | (1) | (1)
Investment securities available for sale, fair value | 150 | 127
Investment securities available for sale, unrealized losses | (2) | (2)
Residential mortgage-backed securities |  |
Investment securities available for sale: |  |
Investment securities available for sale, less than 12 months, fair value | 656 | 1,698
Investment securities available for sale, less than 12 months, unrealized losses | (26) | (165)
Investment securities available for sale, 12 months or more, fair value | 3,955 | 3,001
Investment securities available for sale, 12 months or more, unrealized losses | (544) | (465)
Investment securities available for sale, fair value | 4,611 | 4,699
Investment securities available for sale, unrealized losses | (570) | (630)
Commercial mortgage-backed securities |  |
Investment securities available for sale: |  |
Investment securities available for sale, less than 12 months, fair value | 568 | 836
Investment securities available for sale, less than 12 months, unrealized losses | (13) | (53)
Investment securities available for sale, 12 months or more, fair value | 1,003 | 752
Investment securities available for sale, 12 months or more, unrealized losses | (157) | (117)
Investment securities available for sale, fair value | 1,571 | 1,588
Investment securities available for sale, unrealized losses | (170) | (170)
Corporate bonds |  |
Investment securities available for sale: |  |
Investment securities available for sale, less than 12 months, fair value | 360 | 499
Investment securities available for sale, less than 12 months, unrealized losses | (25) | (30)
Investment securities available for sale, 12 months or more, fair value | 140 | 37
Investment securities available for sale, 12 months or more, unrealized losses | (17) | (4)
Investment securities available for sale, fair value | 500 | 536
Investment securities available for sale, unrealized losses | $ (42) | $ (34)

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