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Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | $ 1,587 |
Available for sale securities, amortized cost, after 1 year through 5 years | 5,837 |
Available for sale securities, amortized cost, after 5 years through 10 years | 7,013 |
Available for sale securities, amortized cost, after 10 years | 31,580 |
Securities available for sale debt securities, amortized cost | 46,017 | $ 48,568
Available-for-sale securities, fair value, 1 year or less | 1,550 |
Available-for-sale securities, fair value, after 1 year through 5 years | 5,460 |
Available-for-sale securities, fair value, after 5 years through 10 years | 6,385 |
Available-for-sale securities, fair value, after 10 years | 28,392 |
Available-for-sale securities, fair value | $ 41,787 | 44,159
Weighted-average yield, GAAP basis, available for sale securities | 2.75% |
Held to maturity securities, amortized cost, 1 year or less | $ 2,359 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 34,930 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 5,792 |
Held to maturity securities, amortized cost, after 10 years | 50,793 |
Held to maturity securities, amortized cost | 93,874 | 95,175
Held-to-maturity securities, fair value, 1 year or less | 2,330 |
Held-to-maturity securities, fair value, after 1 year through 5 years | 33,471 |
Held-to-maturity securities, fair value, after 5 years through 10 years | 5,526 |
Held-to-maturity securities, fair value, after 10 years | 47,569 |
Held-to-maturity securities, fair value | $ 88,896 | $ 90,279
Weighted-average yield, GAAP basis, held to maturity securities | 2.36% |
1 Year or Less |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.01% |
Weighted-average yield, GAAP basis, held to maturity securities | 1.30% |
After 1 Year through 5 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.17% |
Weighted-average yield, GAAP basis, held to maturity securities | 1.39% |
After 5 Years through 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.39% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.65% |
After 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.98% |
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 | $ 1,230 |
Available for sale securities, amortized cost, after 1 year through 5 years | 2,918 |
Available for sale securities, amortized cost, after 5 years through 10 years | 1,724 |
Available for sale securities, amortized cost, after 10 years | 1,991 |
Securities available for sale debt securities, amortized cost | 7,863 |
Held to maturity securities, amortized cost, 1 year or less | 2,075 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 31,522 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 2,477 |
Held to maturity securities, amortized cost, after 10 years | 911 |
Held to maturity securities, amortized cost | 36,985 |
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 | 134 |
Available for sale securities, amortized cost, after 5 years through 10 years | 3,675 |
Available for sale securities, amortized cost, after 10 years | 27,057 |
Securities available for sale debt securities, amortized cost | 30,867 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 7 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 333 |
Held to maturity securities, amortized cost, after 10 years | 43,938 |
Held to maturity securities, amortized cost | 44,278 |
Residential mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, after 5 years through 10 years | 8 |
Available for sale securities, amortized cost, after 10 years | 634 |
Securities available for sale debt securities, amortized cost | 642 |
Held to maturity securities, amortized cost, after 10 years | 269 |
Held to maturity securities, amortized cost | 269 |
Commercial mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 49 |
Available for sale securities, amortized cost, after 1 year through 5 years | 409 |
Available for sale securities, amortized cost, after 5 years through 10 years | 905 |
Available for sale securities, amortized cost, after 10 years | 396 |
Securities available for sale debt securities, amortized cost | 1,759 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 133 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 430 |
Held to maturity securities, amortized cost, after 10 years | 276 |
Held to maturity securities, amortized cost | 839 |
Commercial mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, after 1 year through 5 years | 119 |
Available for sale securities, amortized cost, after 5 years through 10 years | 100 |
Available for sale securities, amortized cost, after 10 years | 795 |
Securities available for sale debt securities, amortized cost | 1,014 |
Held to maturity securities, amortized cost, 1 year or less | 43 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 49 |
Held to maturity securities, amortized cost, after 10 years | 1,457 |
Held to maturity securities, amortized cost | 1,549 |
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 | 106 |
Available for sale securities, amortized cost, after 10 years | 555 |
Securities available for sale debt securities, amortized cost | 910 |
Held to maturity securities, amortized cost, 1 year or less | 11 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 2,103 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 1,949 |
Held to maturity securities, amortized cost, after 10 years | 2,582 |
Held to maturity securities, amortized cost | 6,645 |
Other |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 307 |
Available for sale securities, amortized cost, after 1 year through 5 years | 2,008 |
Available for sale securities, amortized cost, after 5 years through 10 years | 495 |
Available for sale securities, amortized cost, after 10 years | 152 |
Securities available for sale debt securities, amortized cost | 2,962 |
Held to maturity securities, amortized cost, 1 year or less | 230 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 1,116 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 603 |
Held to maturity securities, amortized cost, after 10 years | 1,360 |
Held to maturity securities, amortized cost | $ 3,309 |

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