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Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | $ 2,367 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 6,226 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 5,567 |
Available for Sale Securities, Amortized Cost, After 10 years | 31,193 |
Available-for-sale Securities, Amortized Cost | 45,353 | $ 48,568
Available-for-sale Securities, Fair value, 1 year or less | 2,309 |
Available-for-sale Securities, Fair value, After 1 year through 5 years | 5,822 |
Available-for-sale Securities, Fair value, After 5 years through 10 years | 5,265 |
Available-for-sale Securities, Fair Value, After 10 years | 28,389 |
Available-for-sale Securities, Fair Value | $ 41,785 | 44,159
Weighted-average yield, GAAP basis, available for sale securities | 2.88% |
Held-to-maturity Securities, Amortized Cost, 1 year or less | $ 8,429 |
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years | 28,669 |
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years | 5,379 |
Held-to-maturity Securities, Amortized Cost, After 10 years | 48,307 |
Held-to-maturity, Amortized costs | 90,784 | 95,175
Held-to-maturity Securities, Fair Value, 1 year or less | 8,299 |
Held-to-maturity Securities, Fair Value, After 1 year through 5 years | 27,830 |
Held-to-maturity, Securities, Fair Value, After 5 through 10 years | 5,232 |
Held-to-maturity, Securities, Fair Value, After 10 years | 45,587 |
Debt Securities, Held-to-maturity, Fair Value | $ 86,948 | 90,279
Weighted-average yield, GAAP basis, held to maturity securities | 2.37% |
One Year or Less |  |
Debt Securities, Available-for-sale [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 0.99% |
Weighted-average yield, GAAP basis, held to maturity securities | 0.85% |
After One Year Through Five Years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.32% |
Weighted-average yield, GAAP basis, held to maturity securities | 1.55% |
After Five Years Through Ten Years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.94% |
Weighted-average yield, GAAP basis, held to maturity securities | 4.20% |
After Ten Years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 3.12% |
Weighted-average yield, GAAP basis, held to maturity securities | 2.92% |
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | $ 2,055 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 2,968 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 461 |
Available for Sale Securities, Amortized Cost, After 10 years | 2,112 |
Available-for-sale Securities, Amortized Cost | 7,596 | 9,196
Available-for-sale Securities, Fair Value | 6,951 | 8,370
Held-to-maturity Securities, Amortized Cost, 1 year or less | 8,177 |
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years | 25,744 |
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years | 1,711 |
Held-to-maturity Securities, Amortized Cost, After 10 years | 897 |
Held-to-maturity, Amortized costs | 36,529 | 36,571
Debt Securities, Held-to-maturity, Fair Value | 35,397 | 34,960
Residential mortgage-backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 1 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 210 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 3,766 |
Available for Sale Securities, Amortized Cost, After 10 years | 26,666 |
Available-for-sale Securities, Amortized Cost | 30,643 |
Held-to-maturity Securities, Amortized Cost, 1 year or less |  |
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years | 10 |
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years | 329 |
Held-to-maturity Securities, Amortized Cost, After 10 years | 42,347 |
Held-to-maturity, Amortized costs | 42,686 |
Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less |  |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years |  |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 12 |
Available for Sale Securities, Amortized Cost, After 10 years | 573 |
Available-for-sale Securities, Amortized Cost | 585 |
Held-to-maturity Securities, Amortized Cost, 1 year or less |  |
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years |  |
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years |  |
Held-to-maturity Securities, Amortized Cost, After 10 years | 259 |
Held-to-maturity, Amortized costs | 259 |
Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 31 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 576 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 718 |
Available for Sale Securities, Amortized Cost, After 10 years | 355 |
Available-for-sale Securities, Amortized Cost | 1,680 |
Held-to-maturity Securities, Amortized Cost, 1 year or less |  |
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years | 151 |
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years | 518 |
Held-to-maturity Securities, Amortized Cost, After 10 years | 270 |
Held-to-maturity, Amortized costs | 939 |
Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 1 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 106 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 118 |
Available for Sale Securities, Amortized Cost, After 10 years | 688 |
Available-for-sale Securities, Amortized Cost | 913 |
Held-to-maturity Securities, Amortized Cost, 1 year or less | 29 |
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years | 50 |
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years |  |
Held-to-maturity Securities, Amortized Cost, After 10 years | 1,294 |
Held-to-maturity, Amortized costs | 1,373 |
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less |  |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 273 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 171 |
Available for Sale Securities, Amortized Cost, After 10 years | 648 |
Available-for-sale Securities, Amortized Cost | 1,092 |
Held-to-maturity Securities, Amortized Cost, 1 year or less | 2 |
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years | 1,689 |
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years | 2,269 |
Held-to-maturity Securities, Amortized Cost, After 10 years | 1,930 |
Held-to-maturity, Amortized costs | 5,890 |
Other debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 279 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 2,093 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 321 |
Available for Sale Securities, Amortized Cost, After 10 years | 151 |
Available-for-sale Securities, Amortized Cost | 2,844 | 3,288
Available-for-sale Securities, Fair Value | 2,727 | 3,087
Held-to-maturity Securities, Amortized Cost, 1 year or less | 221 |
Held-to-maturity Securities, Amortized Cost, After 1 year through 5 years | 1,025 |
Held-to-maturity Securities, Amortized Cost, After 5 years through 10 years | 552 |
Held-to-maturity Securities, Amortized Cost, After 10 years | 1,310 |
Held-to-maturity, Amortized costs | 3,108 | 3,354
Debt Securities, Held-to-maturity, Fair Value | $ 3,123 | $ 3,307

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