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Investment Securities - Fair Value and Gross Unrealized Losses on Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 2,662 | $ 2,253
12 months or more | 29,971 | 32,243
Total | 32,633 | 34,496
Unrealized Losses |  |
Less than 12 months | (11) | (34)
12 months or more | (3,163) | (4,303)
Total | (3,174) | (4,337)
U.S. Treasury and federal agencies securities |  |
Fair Value |  |
Less than 12 months | 1,555 | 569
12 months or more | 0 | 0
Total | 1,555 | 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 | 894 | 1,061
12 months or more | 4,655 | 4,566
Total | 5,549 | 5,627
Unrealized Losses |  |
Less than 12 months | (9) | (14)
12 months or more | (570) | (765)
Total | (579) | (779)
Agency mortgage-backed securities | Commercial mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 62 | 157
12 months or more | 20,290 | 20,536
Total | 20,352 | 20,693
Unrealized Losses |  |
Less than 12 months | (1) | (6)
12 months or more | (2,251) | (3,016)
Total | (2,252) | (3,022)
Non-agency commercial mortgage-backed securities | Commercial mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 0 | 183
12 months or more | 2,811 | 3,984
Total | 2,811 | 4,167
Unrealized Losses |  |
Less than 12 months | 0 | (3)
12 months or more | (217) | (335)
Total | (217) | (338)
Asset-backed securities and other debt securities |  |
Fair Value |  |
Less than 12 months | 151 | 283
12 months or more | 2,215 | 3,157
Total | 2,366 | 3,440
Unrealized Losses |  |
Less than 12 months | (1) | (11)
12 months or more | (125) | (187)
Total | $ (126) | $ (198)

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