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Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | $ 1,490 |
Available for sale securities, amortized cost, after 1 year through 5 years | 5,994 |
Available for sale securities, amortized cost, after 5 years through 10 years | 15,770 |
Available for sale securities, amortized cost, after 10 years | 31,642 |
Securities available for sale debt securities, amortized cost | 54,896 | $ 45,353
Available-for-sale securities, fair value, 1 year or less | 1,480 |
Available-for-sale securities, fair value, after 1 year through 5 years | 5,808 |
Available-for-sale securities, fair value, after 5 years through 10 years | 15,422 |
Available-for-sale securities, fair value, after 10 years | 28,478 |
Available-for-sale securities, fair value | $ 51,188 | 41,785
Weighted-average yield, GAAP basis, available for sale securities | 3.63% |
Held to maturity securities, amortized cost, 1 year or less | $ 10,585 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 25,099 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 5,192 |
Held to maturity securities, amortized cost, after 10 years | 46,581 |
Held to maturity securities, amortized cost | 87,457 | 90,784
Held-to-maturity securities, fair value, 1 year or less | 10,461 |
Held-to-maturity securities, fair value, after 1 year through 5 years | 24,133 |
Held-to-maturity securities, fair value, after 5 years through 10 years | 4,989 |
Held-to-maturity securities, fair value, after 10 years | 42,672 |
Held-to-maturity securities, fair value | $ 82,255 | 86,948
Weighted-average yield, GAAP basis, held to maturity securities | 2.38% |
1 Year or Less |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.43% |
Weighted-average yield, GAAP basis, held to maturity securities | 0.96% |
After 1 Year through 5 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 3.57% |
Weighted-average yield, GAAP basis, held to maturity securities | 1.60% |
After 5 Years through 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 4.13% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.79% |
After 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 3.50% |
Weighted-average yield, GAAP basis, held to maturity securities | 2.97% |
U.S. Treasury and government agencies |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | $ 1,202 |
Available for sale securities, amortized cost, after 1 year through 5 years | 2,470 |
Available for sale securities, amortized cost, after 5 years through 10 years | 10,854 |
Available for sale securities, amortized cost, after 10 years | 2,342 |
Securities available for sale debt securities, amortized cost | 16,868 | 7,596
Available-for-sale securities, fair value | 16,474 | 6,951
Held to maturity securities, amortized cost, 1 year or less | 10,363 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 22,586 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 1,635 |
Held to maturity securities, amortized cost, after 10 years | 884 |
Held to maturity securities, amortized cost | 35,468 | 36,529
Held-to-maturity securities, fair value | 34,166 | 35,397
Residential mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities [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 | 222 |
Available for sale securities, amortized cost, after 5 years through 10 years | 3,472 |
Available for sale securities, amortized cost, after 10 years | 26,539 |
Securities available for sale debt securities, amortized cost | 30,234 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 9 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 309 |
Held to maturity securities, amortized cost, after 10 years | 41,547 |
Held to maturity securities, amortized cost | 41,865 |
Residential mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, after 5 years through 10 years | 11 |
Available for sale securities, amortized cost, after 10 years | 523 |
Securities available for sale debt securities, amortized cost | 534 |
Held to maturity securities, amortized cost, after 10 years | 250 |
Held to maturity securities, amortized cost | 250 |
Commercial mortgage servicing rights | Mortgage-backed Securities Agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 6 |
Available for sale securities, amortized cost, after 1 year through 5 years | 664 |
Available for sale securities, amortized cost, after 5 years through 10 years | 751 |
Available for sale securities, amortized cost, after 10 years | 337 |
Securities available for sale debt securities, amortized cost | 1,758 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 158 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 587 |
Held to maturity securities, amortized cost, after 10 years | 211 |
Held to maturity securities, amortized cost | 956 |
Commercial mortgage servicing rights | Mortgage-backed Securities Non-agency |  |
Debt Securities [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 | 105 |
Available for sale securities, amortized cost, after 5 years through 10 years | 73 |
Available for sale securities, amortized cost, after 10 years | 645 |
Securities available for sale debt securities, amortized cost | 824 |
Held to maturity securities, amortized cost, 1 year or less |  |
Held to maturity securities, amortized cost, after 1 year through 5 years | 49 |
Held to maturity securities, amortized cost, after 10 years | 1,140 |
Held to maturity securities, amortized cost | 1,189 |
Asset-backed |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, after 1 year through 5 years | 667 |
Available for sale securities, amortized cost, after 5 years through 10 years | 318 |
Available for sale securities, amortized cost, after 10 years | 1,112 |
Securities available for sale debt securities, amortized cost | 2,097 |
Held to maturity securities, amortized cost, 1 year or less | 20 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 1,329 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 2,228 |
Held to maturity securities, amortized cost, after 10 years | 1,256 |
Held to maturity securities, amortized cost | 4,833 |
Other |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 280 |
Available for sale securities, amortized cost, after 1 year through 5 years | 1,866 |
Available for sale securities, amortized cost, after 5 years through 10 years | 291 |
Available for sale securities, amortized cost, after 10 years | 144 |
Securities available for sale debt securities, amortized cost | 2,581 | 2,844
Available-for-sale securities, fair value | 2,460 | 2,727
Held to maturity securities, amortized cost, 1 year or less | 202 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 968 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 433 |
Held to maturity securities, amortized cost, after 10 years | 1,293 |
Held to maturity securities, amortized cost | 2,896 | 3,108
Held-to-maturity securities, fair value | $ 2,863 | $ 3,123

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