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Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | $ 2,246 |
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 | 6,190 |
Available for sale securities, amortized cost, after 10 years | 31,560 |
Securities available for sale debt securities, amortized cost | 45,990 | $ 48,568
Available-for-sale securities, fair value, 1 year or less | 2,179 |
Available-for-sale securities, fair value, after 1 year through 5 years | 5,487 |
Available-for-sale securities, fair value, after 5 years through 10 years | 5,603 |
Available-for-sale securities, fair value, after 10 years | 27,321 |
Available-for-sale securities, fair value | $ 40,590 | 44,159
Weighted-average yield, GAAP basis, available for sale securities | 2.84% |
Held to maturity securities, amortized cost, 1 year or less | $ 3,317 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 33,816 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 5,065 |
Held to maturity securities, amortized cost, after 10 years | 49,599 |
Held to maturity securities, amortized cost | 91,797 | 95,175
Held-to-maturity securities, fair value, 1 year or less | 3,253 |
Held-to-maturity securities, fair value, after 1 year through 5 years | 32,192 |
Held-to-maturity securities, fair value, after 5 years through 10 years | 4,753 |
Held-to-maturity securities, fair value, after 10 years | 44,249 |
Held-to-maturity securities, fair value | $ 84,447 | 90,279
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 | 1.25% |
Weighted-average yield, GAAP basis, held to maturity securities | 0.93% |
After 1 Year through 5 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.25% |
Weighted-average yield, GAAP basis, held to maturity securities | 1.44% |
After 5 Years through 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.77% |
Weighted-average yield, GAAP basis, held to maturity securities | 4.10% |
After 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 3.08% |
Weighted-average yield, GAAP basis, held to maturity securities | 2.93% |
U.S. Treasury and government agencies |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | $ 1,912 |
Available for sale securities, amortized cost, after 1 year through 5 years | 2,958 |
Available for sale securities, amortized cost, after 5 years through 10 years | 800 |
Available for sale securities, amortized cost, after 10 years | 1,824 |
Securities available for sale debt securities, amortized cost | 7,494 | 9,196
Available-for-sale securities, fair value | 6,717 | 8,370
Held to maturity securities, amortized cost, 1 year or less | 3,087 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 30,686 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 1,705 |
Held to maturity securities, amortized cost, after 10 years | 907 |
Held to maturity securities, amortized cost | 36,385 | 36,571
Held-to-maturity securities, fair value | 34,439 | 34,960
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 | 185 |
Available for sale securities, amortized cost, after 5 years through 10 years | 3,811 |
Available for sale securities, amortized cost, after 10 years | 27,180 |
Securities available for sale debt securities, amortized cost | 31,177 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 6 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 321 |
Held to maturity securities, amortized cost, after 10 years | 43,063 |
Held to maturity securities, amortized cost | 43,390 |
Residential mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, after 5 years through 10 years | 9 |
Available for sale securities, amortized cost, after 10 years | 598 |
Securities available for sale debt securities, amortized cost | 607 |
Held to maturity securities, amortized cost, after 10 years | 263 |
Held to maturity securities, amortized cost | 263 |
Commercial mortgage servicing rights | Mortgage-backed Securities Agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 46 |
Available for sale securities, amortized cost, after 1 year through 5 years | 444 |
Available for sale securities, amortized cost, after 5 years through 10 years | 865 |
Available for sale securities, amortized cost, after 10 years | 383 |
Securities available for sale debt securities, amortized cost | 1,738 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 136 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 490 |
Held to maturity securities, amortized cost, after 10 years | 284 |
Held to maturity securities, amortized cost | 910 |
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 | 103 |
Available for sale securities, amortized cost, after 5 years through 10 years | 118 |
Available for sale securities, amortized cost, after 10 years | 760 |
Securities available for sale debt securities, amortized cost | 982 |
Held to maturity securities, amortized cost, 1 year or less | 42 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 49 |
Held to maturity securities, amortized cost, after 10 years | 1,365 |
Held to maturity securities, amortized cost | 1,456 |
Asset-backed |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, after 1 year through 5 years | 249 |
Available for sale securities, amortized cost, after 5 years through 10 years | 171 |
Available for sale securities, amortized cost, after 10 years | 664 |
Securities available for sale debt securities, amortized cost | 1,084 |
Held to maturity securities, amortized cost, 1 year or less | 7 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 1,886 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 1,949 |
Held to maturity securities, amortized cost, after 10 years | 2,372 |
Held to maturity securities, amortized cost | 6,214 |
Other |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 286 |
Available for sale securities, amortized cost, after 1 year through 5 years | 2,055 |
Available for sale securities, amortized cost, after 5 years through 10 years | 416 |
Available for sale securities, amortized cost, after 10 years | 151 |
Securities available for sale debt securities, amortized cost | 2,908 | 3,288
Available-for-sale securities, fair value | 2,699 | 3,087
Held to maturity securities, amortized cost, 1 year or less | 181 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 1,053 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 600 |
Held to maturity securities, amortized cost, after 10 years | 1,345 |
Held to maturity securities, amortized cost | 3,179 | 3,354
Held-to-maturity securities, fair value | $ 3,040 | $ 3,307

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