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Investment Securities - Amortized Cost, Fair Value and Yield by Maturity Date (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Amortized Cost |  |  |  |  |  |
Amortized Cost | [1] | $ 76,931 |  | $ 76,931 |  | $ 78,634
Fair Value |  |  |  |  |  |
Fair Value |  | $ 67,346 |  | $ 67,346 |  | $ 66,275
Weighted- Average Maturity in Years |  |  |  |  |  |
Total |  |  |  | 8 years 1 month 6 days |  |
Weighted-Average Yield |  |  |  |  |  |
Total |  | 2.31% |  | 2.31% |  | 2.20%
Weighted average maturity of total held to maturity investment securities |  |  |  |  |  | 8 years 8 months 12 days
Amortized Cost |  |  |  |  |  |
Amortized Cost |  | $ 93,817 |  | $ 93,817 |  |
Fair Value |  |  |  |  |  |
Fair Value | [1] | $ 89,065 |  | $ 89,065 |  | $ 85,992
Weighted- Average Maturity in Years |  |  |  |  |  |
Total |  |  |  | 6 years |  | 6 years 9 months 18 days
Weighted-Average Yield |  |  |  |  |  |
Total |  | 3.59% |  | 3.59% |  | 3.67%
Federal statutory rate |  | 21.00% | 21.00% | 21.00% | 21.00% |
Portfolio basis adjustments excluded from amortized cost |  | $ 304 |  | $ 304 |  |
U.S. Treasury and agencies |  |  |  |  |  |
Amortized Cost |  |  |  |  |  |
Maturing in one year or less |  | 0 |  | 0 |  |
Maturing after one year through five years |  | 647 |  | 647 |  |
Maturing after five years through ten years |  | 0 |  | 0 |  |
Maturing after ten years |  | 0 |  | 0 |  |
Amortized Cost |  | 647 |  | 647 |  | $ 1,296
Fair Value |  |  |  |  |  |
Maturing in one year or less |  | 0 |  | 0 |  |
Maturing after one year through five years |  | 641 |  | 641 |  |
Maturing after five years through ten years |  | 0 |  | 0 |  |
Maturing after ten years |  | 0 |  | 0 |  |
Fair Value |  | $ 641 |  | $ 641 |  | 1,275
Weighted- Average Maturity in Years |  |  |  |  |  |
Maturing after one year through five years |  |  |  | 1 year 7 months 6 days |  |
Total |  |  |  | 1 year 7 months 6 days |  |
Weighted-Average Yield |  |  |  |  |  |
Maturing in one year or less |  | 0.00% |  | 0.00% |  |
Maturing after one year through five years |  | 3.00% |  | 3.00% |  |
Maturing after five years through ten years |  | 0.00% |  | 0.00% |  |
Maturing after ten years |  | 0.00% |  | 0.00% |  |
Total |  | 3.00% |  | 3.00% |  |
Maturing in one year or less |  |  |  | 1 month 6 days |  |
Amortized Cost |  |  |  |  |  |
Maturing in one year or less |  | $ 10 |  | $ 10 |  |
Maturing after one year through five years |  | 15,513 |  | 15,513 |  |
Maturing after five years through ten years |  | 12,843 |  | 12,843 |  |
Maturing after ten years |  | 190 |  | 190 |  |
Amortized Cost |  | 28,556 |  | 28,556 |  |
Fair Value |  |  |  |  |  |
Maturing in one year or less |  | 10 |  | 10 |  |
Maturing after one year through five years |  | 14,986 |  | 14,986 |  |
Maturing after five years through ten years |  | 11,924 |  | 11,924 |  |
Maturing after ten years |  | 148 |  | 148 |  |
Fair Value |  | $ 27,068 |  | $ 27,068 |  | 28,387
Weighted- Average Maturity in Years |  |  |  |  |  |
Maturing in one year or less |  |  |  | 1 month 6 days |  |
Maturing after one year through five years |  |  |  | 2 years 9 months 18 days |  |
Maturing after five years through ten years |  |  |  | 6 years 1 month 6 days |  |
Maturing after ten years |  |  |  | 10 years 2 months 12 days |  |
Total |  |  |  | 4 years 3 months 18 days |  |
Weighted-Average Yield |  |  |  |  |  |
Maturing in one year or less |  | 4.11% |  | 4.11% |  |
Maturing after one year through five years |  | 2.38% |  | 2.38% |  |
Maturing after five years through ten years |  | 2.75% |  | 2.75% |  |
Maturing after ten years |  | 1.86% |  | 1.86% |  |
Total |  | 2.54% |  | 2.54% |  |
Mortgage-backed securities |  |  |  |  |  |
Amortized Cost |  |  |  |  |  |
Maturing in one year or less |  | $ 244 |  | $ 244 |  |
Maturing after one year through five years |  | 3,356 |  | 3,356 |  |
Maturing after five years through ten years |  | 72,415 |  | 72,415 |  |
Maturing after ten years |  | 7 |  | 7 |  |
Amortized Cost |  | 76,022 |  | 76,022 |  |
Fair Value |  |  |  |  |  |
Maturing in one year or less |  | 246 |  | 246 |  |
Maturing after one year through five years |  | 3,407 |  | 3,407 |  |
Maturing after five years through ten years |  | 62,780 |  | 62,780 |  |
Maturing after ten years |  | 7 |  | 7 |  |
Fair Value |  | $ 66,440 |  | $ 66,440 |  |
Weighted- Average Maturity in Years |  |  |  |  |  |
Maturing in one year or less |  |  |  | 7 months 6 days |  |
Maturing after one year through five years |  |  |  | 4 years |  |
Maturing after five years through ten years |  |  |  | 8 years 4 months 24 days |  |
Maturing after ten years |  |  |  | 18 years 7 months 6 days |  |
Total |  |  |  | 8 years 2 months 12 days |  |
Weighted-Average Yield |  |  |  |  |  |
Maturing in one year or less |  | 4.81% |  | 4.81% |  |
Maturing after one year through five years |  | 4.96% |  | 4.96% |  |
Maturing after five years through ten years |  | 2.17% |  | 2.17% |  |
Maturing after ten years |  | 1.81% |  | 1.81% |  |
Total |  | 2.31% |  | 2.31% |  |
Maturing in one year or less |  |  |  | 9 months 18 days |  |
Amortized Cost |  |  |  |  |  |
Maturing in one year or less |  | $ 364 |  | $ 364 |  |
Maturing after one year through five years |  | 12,162 |  | 12,162 |  |
Maturing after five years through ten years |  | 34,818 |  | 34,818 |  |
Maturing after ten years |  | 239 |  | 239 |  |
Amortized Cost |  | 47,583 |  | 47,583 |  |
Fair Value |  |  |  |  |  |
Maturing in one year or less |  | 358 |  | 358 |  |
Maturing after one year through five years |  | 11,673 |  | 11,673 |  |
Maturing after five years through ten years |  | 33,119 |  | 33,119 |  |
Maturing after ten years |  | 228 |  | 228 |  |
Fair Value |  | $ 45,378 |  | $ 45,378 |  |
Weighted- Average Maturity in Years |  |  |  |  |  |
Maturing in one year or less |  |  |  | 9 months 18 days |  |
Maturing after one year through five years |  |  |  | 4 years 6 months |  |
Maturing after five years through ten years |  |  |  | 6 years 9 months 18 days |  |
Maturing after ten years |  |  |  | 10 years 9 months 18 days |  |
Total |  |  |  | 6 years 2 months 12 days |  |
Weighted-Average Yield |  |  |  |  |  |
Maturing in one year or less |  | 1.95% |  | 1.95% |  |
Maturing after one year through five years |  | 3.44% |  | 3.44% |  |
Maturing after five years through ten years |  | 4.13% |  | 4.13% |  |
Maturing after ten years |  | 5.38% |  | 5.38% |  |
Total |  | 3.94% |  | 3.94% |  |
Asset-backed securities |  |  |  |  |  |
Amortized Cost |  |  |  |  |  |
Maturing in one year or less |  | $ 10 |  | $ 10 |  |
Maturing after one year through five years |  | 2,629 |  | 2,629 |  |
Maturing after five years through ten years |  | 4,203 |  | 4,203 |  |
Maturing after ten years |  | 0 |  | 0 |  |
Amortized Cost |  | 6,842 |  | 6,842 |  |
Fair Value |  |  |  |  |  |
Maturing in one year or less |  | 10 |  | 10 |  |
Maturing after one year through five years |  | 2,641 |  | 2,641 |  |
Maturing after five years through ten years |  | 4,214 |  | 4,214 |  |
Maturing after ten years |  | 0 |  | 0 |  |
Fair Value |  | $ 6,865 |  | $ 6,865 |  | 7,165
Weighted- Average Maturity in Years |  |  |  |  |  |
Maturing after one year through five years |  |  |  | 2 years |  |
Maturing after five years through ten years |  |  |  | 5 years 6 months |  |
Total |  |  |  | 4 years 2 months 12 days |  |
Weighted-Average Yield |  |  |  |  |  |
Maturing in one year or less |  | 7.04% |  | 7.04% |  |
Maturing after one year through five years |  | 4.85% |  | 4.85% |  |
Maturing after five years through ten years |  | 5.67% |  | 5.67% |  |
Maturing after ten years |  | 0.00% |  | 0.00% |  |
Total |  | 5.36% |  | 5.36% |  |
Obligations of state and political subdivisions |  |  |  |  |  |
Weighted-Average Yield |  |  |  |  |  |
Maturing in one year or less |  |  |  | 4 months 24 days |  |
Amortized Cost |  |  |  |  |  |
Maturing in one year or less |  | $ 450 |  | $ 450 |  |
Maturing after one year through five years |  | 1,805 |  | 1,805 |  |
Maturing after five years through ten years |  | 1,174 |  | 1,174 |  |
Maturing after ten years |  | 7,142 |  | 7,142 |  |
Amortized Cost |  | 10,571 |  | 10,571 |  |
Fair Value |  |  |  |  |  |
Maturing in one year or less |  | 450 |  | 450 |  |
Maturing after one year through five years |  | 1,797 |  | 1,797 |  |
Maturing after five years through ten years |  | 1,105 |  | 1,105 |  |
Maturing after ten years |  | 6,134 |  | 6,134 |  |
Fair Value |  | $ 9,486 |  | $ 9,486 |  | 9,552
Weighted- Average Maturity in Years |  |  |  |  |  |
Maturing in one year or less |  |  |  | 4 months 24 days |  |
Maturing after one year through five years |  |  |  | 2 years 3 months 18 days |  |
Maturing after five years through ten years |  |  |  | 7 years 7 months 6 days |  |
Maturing after ten years |  |  |  | 14 years 6 months |  |
Total |  |  |  | 11 years 1 month 6 days |  |
Weighted-Average Yield |  |  |  |  |  |
Maturing in one year or less |  | 4.32% |  | 4.32% |  |
Maturing after one year through five years |  | 4.47% |  | 4.47% |  |
Maturing after five years through ten years |  | 3.46% |  | 3.46% |  |
Maturing after ten years |  | 3.49% |  | 3.49% |  |
Total |  | 3.69% |  | 3.69% |  |
Other |  |  |  |  |  |
Amortized Cost |  |  |  |  |  |
Maturing in one year or less |  | $ 55 |  | $ 55 |  |
Maturing after one year through five years |  | 207 |  | 207 |  |
Maturing after five years through ten years |  | 0 |  | 0 |  |
Maturing after ten years |  | 0 |  | 0 |  |
Amortized Cost |  | 262 |  | 262 |  | 244
Fair Value |  |  |  |  |  |
Maturing in one year or less |  | 55 |  | 55 |  |
Maturing after one year through five years |  | 210 |  | 210 |  |
Maturing after five years through ten years |  | 0 |  | 0 |  |
Maturing after ten years |  | 0 |  | 0 |  |
Fair Value |  | $ 265 |  | $ 265 |  | 247
Weighted- Average Maturity in Years |  |  |  |  |  |
Maturing in one year or less |  |  |  | 9 months 18 days |  |
Maturing after one year through five years |  |  |  | 1 year 10 months 24 days |  |
Total |  |  |  | 1 year 8 months 12 days |  |
Weighted-Average Yield |  |  |  |  |  |
Maturing in one year or less |  | 2.73% |  | 2.73% |  |
Maturing after one year through five years |  | 2.67% |  | 2.67% |  |
Maturing after five years through ten years |  | 0.00% |  | 0.00% |  |
Maturing after ten years |  | 0.00% |  | 0.00% |  |
Total |  | 2.68% |  | 2.68% |  |
Maturing in one year or less |  |  |  | 7 months 6 days |  |
Amortized Cost |  |  |  |  |  |
Maturing in one year or less |  | $ 109 |  | $ 109 |  |
Maturing after one year through five years |  | 156 |  | 156 |  |
Maturing after five years through ten years |  | 0 |  | 0 |  |
Maturing after ten years |  | 0 |  | 0 |  |
Amortized Cost |  | 265 |  | 265 |  |
Fair Value |  |  |  |  |  |
Maturing in one year or less |  | 109 |  | 109 |  |
Maturing after one year through five years |  | 159 |  | 159 |  |
Maturing after five years through ten years |  | 0 |  | 0 |  |
Maturing after ten years |  | 0 |  | 0 |  |
Fair Value |  | $ 268 |  | $ 268 |  | $ 250
Weighted- Average Maturity in Years |  |  |  |  |  |
Maturing in one year or less |  |  |  | 7 months 6 days |  |
Maturing after one year through five years |  |  |  | 2 years 3 months 18 days |  |
Total |  |  |  | 1 year 7 months 6 days |  |
Weighted-Average Yield |  |  |  |  |  |
Maturing in one year or less |  | 4.96% |  | 4.96% |  |
Maturing after one year through five years |  | 4.54% |  | 4.54% |  |
Maturing after five years through ten years |  | 0.00% |  | 0.00% |  |
Maturing after ten years |  | 0.00% |  | 0.00% |  |
Total |  | 4.71% |  | 4.71% |  |
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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