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Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | $ 3,541 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 27,471 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 16,894 |
Available for Sale Securities, Amortized Cost, After 10 years | 75,113 |
Securities available for sale debt securities, amortized cost | 123,019 | $ 84,172
Available-for-sale Securities, Fair value, 1 year or less | 3,562 |
Available-for-sale Securities, Fair value, After 1 year through 5 years | 27,856 |
Available-for-sale Securities, Fair value, After 5 years through 10 years | 17,091 |
Available-for-sale Securities, Fair value, After 10 years | 76,549 |
Available-for-sale securities, fair value | $ 125,058 | 87,358
Weighted-average yield, GAAP basis, available for sale securities | 2.19% |
Held to Maturity Securities, Amortized Cost, 1 year or less | $ 80 |
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years | 623 |
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years | 416 |
Held to Maturity Securities, Amortized Cost, After 10 years | 366 |
Held to maturity securities, amortized cost | 1,485 | 1,441
Held-to-maturity Securities, Fair Value, 1 year or less | 81 |
Held-to-maturity Securities, Fair Value, After 1 year through 5 years | 651 |
Held-to-maturity Securities, Fair Value, After 5 years through 10 years | 483 |
Held-to-maturity Securities, Fair Value, After 10 years | 383 |
Held-to-maturity Securities, Debt Maturities, Fair Value, Total | $ 1,598 | $ 1,605
Weighted-average yield, GAAP basis, held to maturity securities | 3.16% |
1 Year or Less |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.42% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.24% |
After 1 Year through 5 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.25% |
Weighted-average yield, GAAP basis, held to maturity securities | 2.95% |
After 5 Years through 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.60% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.91% |
After 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.49% |
Weighted-average yield, GAAP basis, held to maturity securities | 2.61% |
U.S. Treasury and government agencies |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | $ 2,751 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 22,506 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 11,358 |
Available for Sale Securities, Amortized Cost, After 10 years | 1,949 |
Securities available for sale debt securities, amortized cost | 38,564 |
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years | 199 |
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years | 318 |
Held to Maturity Securities, Amortized Cost, After 10 years | 287 |
Held to maturity securities, amortized cost | 804 |
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 | 123 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 2,124 |
Available for Sale Securities, Amortized Cost, After 10 years | 64,145 |
Securities available for sale debt securities, amortized cost | 66,393 |
Residential mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 2 |
Available for Sale Securities, Amortized Cost, After 10 years | 1,079 |
Securities available for sale debt securities, amortized cost | 1,081 |
Commercial mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 64 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 520 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 804 |
Available for Sale Securities, Amortized Cost, After 10 years | 875 |
Securities available for sale debt securities, amortized cost | 2,263 |
Commercial mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 174 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 210 |
Available for Sale Securities, Amortized Cost, After 10 years | 3,649 |
Securities available for sale debt securities, amortized cost | 4,033 |
Asset-backed |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 109 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 2,117 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 771 |
Available for Sale Securities, Amortized Cost, After 10 years | 2,628 |
Securities available for sale debt securities, amortized cost | 5,625 |
Other |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 616 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 2,031 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 1,625 |
Available for Sale Securities, Amortized Cost, After 10 years | 788 |
Securities available for sale debt securities, amortized cost | 5,060 |
Held to Maturity Securities, Amortized Cost, 1 year or less | 80 |
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years | 424 |
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years | 98 |
Held to Maturity Securities, Amortized Cost, After 10 years | 79 |
Held to maturity securities, amortized cost | $ 681 |

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