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INVESTMENTS - Carrying Value and Fair Value of HTM Debt Securities by Contractual Maturity Dates (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount; |  |  |  |  |  |
Amortized cost, net | $ 197,092 |  | $ 242,382 |  |  |
Held-to-maturity Securities, Debt Maturities, Fair Value; |  |  |  |  |  |
Fair value | 185,346 |  | 224,410 |  |  |
Allowance for credit losses on HTM debt securities | 131 | $ 136 | 137 | $ 141 | $ 99 | $ 95
Mortgage-backed securities |  |  |  |  |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount; |  |  |  |  |  |
Due within 1 year, amortized cost | 166 |  |  |  |  |
After 1 but within 5 years, amortized cost | 954 |  |  |  |  |
After 5 but within 10 years, amortized cost | 1,167 |  |  |  |  |
After 10 years, amortized cost | 66,289 |  |  |  |  |
Amortized cost, net | 68,576 |  | 73,789 |  |  |
Held-to-maturity Securities, Debt Maturities, Fair Value; |  |  |  |  |  |
Due within 1 year, fair value | 166 |  |  |  |  |
After 1 but within 5 years, fair value | 931 |  |  |  |  |
After 5 but within 10 years, fair value | 1,105 |  |  |  |  |
After 10 years, fair value | 58,833 |  |  |  |  |
Fair value | 61,035 |  | 63,359 |  |  |
U.S. treasury securities |  |  |  |  |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount; |  |  |  |  |  |
Due within 1 year, amortized cost | 21,941 |  |  |  |  |
After 1 but within 5 years, amortized cost | 70,849 |  |  |  |  |
After 5 but within 10 years, amortized cost | 0 |  |  |  |  |
After 10 years, amortized cost | 0 |  |  |  |  |
Amortized cost, net | 92,790 |  | 126,142 |  |  |
Held-to-maturity Securities, Debt Maturities, Fair Value; |  |  |  |  |  |
Due within 1 year, fair value | 21,564 |  |  |  |  |
After 1 but within 5 years, fair value | 67,488 |  |  |  |  |
After 5 but within 10 years, fair value | 0 |  |  |  |  |
After 10 years, fair value | 0 |  |  |  |  |
Fair value | 89,052 |  | 119,208 |  |  |
State and municipal |  |  |  |  |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount; |  |  |  |  |  |
Due within 1 year, amortized cost | 23 |  |  |  |  |
After 1 but within 5 years, amortized cost | 191 |  |  |  |  |
After 5 but within 10 years, amortized cost | 2,211 |  |  |  |  |
After 10 years, amortized cost | 6,226 |  |  |  |  |
Amortized cost, net | 8,651 |  | 8,903 |  |  |
Held-to-maturity Securities, Debt Maturities, Fair Value; |  |  |  |  |  |
Due within 1 year, fair value | 20 |  |  |  |  |
After 1 but within 5 years, fair value | 190 |  |  |  |  |
After 5 but within 10 years, fair value | 2,137 |  |  |  |  |
After 10 years, fair value | 5,765 |  |  |  |  |
Fair value | 8,112 |  | 8,262 |  |  |
Foreign government |  |  |  |  |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount; |  |  |  |  |  |
Due within 1 year, amortized cost | 173 |  |  |  |  |
After 1 but within 5 years, amortized cost | 598 |  |  |  |  |
After 5 but within 10 years, amortized cost | 0 |  |  |  |  |
After 10 years, amortized cost | 0 |  |  |  |  |
Amortized cost, net | 771 |  | 988 |  |  |
Held-to-maturity Securities, Debt Maturities, Fair Value; |  |  |  |  |  |
Due within 1 year, fair value | 175 |  |  |  |  |
After 1 but within 5 years, fair value | 619 |  |  |  |  |
After 5 but within 10 years, fair value | 0 |  |  |  |  |
After 10 years, fair value | 0 |  |  |  |  |
Fair value | 794 |  | $ 991 |  |  |
All other |  |  |  |  |  |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount; |  |  |  |  |  |
Due within 1 year, amortized cost | 0 |  |  |  |  |
After 1 but within 5 years, amortized cost | 0 |  |  |  |  |
After 5 but within 10 years, amortized cost | 5,159 |  |  |  |  |
After 10 years, amortized cost | 21,145 |  |  |  |  |
Amortized cost, net | 26,304 |  |  |  |  |
Held-to-maturity Securities, Debt Maturities, Fair Value; |  |  |  |  |  |
Due within 1 year, fair value | 0 |  |  |  |  |
After 1 but within 5 years, fair value | 0 |  |  |  |  |
After 5 but within 10 years, fair value | 5,165 |  |  |  |  |
After 10 years, fair value | 21,188 |  |  |  |  |
Fair value | $ 26,353 |  |  |  |  |

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