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INVESTMENT SECURITIES AND OTHER SECURITIES - Contractual Maturities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities, amortized cost: |  |
Under 1 year | $ 2,101 | $ 3,620
After 1 year through 5 years | 5,628 | 5,993
After 5 years through 10 years | 1,921 | 1,857
After 10 years | 18,952 | 19,273
Total available-for-sale securities | 28,602 | 30,743
Available-for-sale securities, fair value: |  |
Under 1 year | 2,096 | 3,624
After 1 year through 5 years | 5,637 | 5,844
After 5 years through 10 years | 1,796 | 1,732
After 10 years | 16,556 | 16,073
Total available-for-sale securities | 26,085 | 27,273
Held-to-maturity securities, amortized cost: |  |
Under 1 year | 404 | 255
After 1 year through 5 years | 1,967 | 1,818
After 5 years through 10 years | 146 | 65
After 10 years | 13,080 | 14,230
Total held-to-maturity securities | 15,597 | 16,368
Held-to-maturity securities, fair value: |  |
Under 1 year | 404 | 256
After 1 year through 5 years | 1,981 | 1,796
After 5 years through 10 years | 134 | 60
After 10 years | 11,350 | 11,974
Total held-to-maturity securities | $ 13,869 | $ 14,086

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