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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Less than 12 months |  |
Fair value | $ 500,000,000 | $ 590,000,000
Unrealized loss | (10,000,000) | (10,000,000)
12 months or longer |  |
Fair value | 22,781,000,000 | 23,331,000,000
Unrealized loss | (4,424,000,000) | (4,000,000,000)
Credit reserves, available-for-sale | 0 | 0
Credit reserves, held-to-maturity | 0 | 0
U.S. Treasury and federal agencies |  |
Less than 12 months |  |
Fair value | 0 | 0
Unrealized loss | 0 | 0
12 months or longer |  |
Fair value | 2,057,000,000 | 2,075,000,000
Unrealized loss | (229,000,000) | (209,000,000)
U.S. States and political subdivisions |  |
Less than 12 months |  |
Fair value | 112,000,000 | 70,000,000
Unrealized loss | (1,000,000) | 0
12 months or longer |  |
Fair value | 488,000,000 | 501,000,000
Unrealized loss | (76,000,000) | (70,000,000)
Foreign government |  |
Less than 12 months |  |
Fair value | 27,000,000 | 16,000,000
Unrealized loss | (1,000,000) | 0
12 months or longer |  |
Fair value | 130,000,000 | 134,000,000
Unrealized loss | (9,000,000) | (8,000,000)
Agency mortgage-backed residential |  |
Less than 12 months |  |
Fair value | 123,000,000 | 300,000,000
Unrealized loss | (2,000,000) | (5,000,000)
12 months or longer |  |
Fair value | 14,606,000,000 | 15,015,000,000
Unrealized loss | (3,077,000,000) | (2,734,000,000)
Mortgage-backed residential |  |
Less than 12 months |  |
Fair value | 0 | 0
Unrealized loss | 0 | 0
12 months or longer |  |
Fair value | 219,000,000 | 225,000,000
Unrealized loss | (45,000,000) | (43,000,000)
Agency mortgage-backed commercial |  |
Less than 12 months |  |
Fair value | 167,000,000 | 153,000,000
Unrealized loss | (5,000,000) | (4,000,000)
12 months or longer |  |
Fair value | 3,448,000,000 | 3,472,000,000
Unrealized loss | (830,000,000) | (779,000,000)
Asset-backed |  |
Less than 12 months |  |
Fair value | 18,000,000 | 18,000,000
Unrealized loss | 0 | 0
12 months or longer |  |
Fair value | 275,000,000 | 302,000,000
Unrealized loss | (9,000,000) | (12,000,000)
Corporate debt |  |
Less than 12 months |  |
Fair value | 53,000,000 | 33,000,000
Unrealized loss | (1,000,000) | (1,000,000)
12 months or longer |  |
Fair value | 1,558,000,000 | 1,607,000,000
Unrealized loss | $ (149,000,000) | $ (145,000,000)

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