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Investment Securities - Fair Value and Gross Unrealized Losses on Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 1,707 | $ 2,253
12 months or more | 31,554 | 32,243
Total | 33,261 | 34,496
Unrealized Losses |  |
Less than 12 months | (21) | (34)
12 months or more | (3,686) | (4,303)
Total | (3,707) | (4,337)
U.S. Treasury and federal agencies securities |  |
Fair Value |  |
Less than 12 months | 38 | 569
12 months or more | 0 | 0
Total | 38 | 569
Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or more | 0 | 0
Total | 0 | 0
Agency mortgage-backed securities | Residential mortgage backed securities |  |
Fair Value |  |
Less than 12 months | 1,196 | 1,061
12 months or more | 4,534 | 4,566
Total | 5,730 | 5,627
Unrealized Losses |  |
Less than 12 months | (15) | (14)
12 months or more | (636) | (765)
Total | (651) | (779)
Agency mortgage-backed securities | Commercial mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 200 | 157
12 months or more | 20,760 | 20,536
Total | 20,960 | 20,693
Unrealized Losses |  |
Less than 12 months | (4) | (6)
12 months or more | (2,601) | (3,016)
Total | (2,605) | (3,022)
Non-agency commercial mortgage-backed securities | Commercial mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 152 | 183
12 months or more | 3,519 | 3,984
Total | 3,671 | 4,167
Unrealized Losses |  |
Less than 12 months | (1) | (3)
12 months or more | (290) | (335)
Total | (291) | (338)
Asset-backed securities and other debt securities |  |
Fair Value |  |
Less than 12 months | 121 | 283
12 months or more | 2,741 | 3,157
Total | 2,862 | 3,440
Unrealized Losses |  |
Less than 12 months | (1) | (11)
12 months or more | (159) | (187)
Total | $ (160) | $ (198)

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