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Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | $ 3,030 |
Available for sale securities, amortized cost, after 1 year through 5 years | 29,571 |
Available for sale securities, amortized cost, after 5 years through 10 years | 14,796 |
Available for sale securities, amortized cost, after 10 years | 69,194 |
Securities available for sale debt securities, amortized cost | 116,591 |
Available-for-sale securities, fair value, 1 year or less | 3,037 |
Available-for-sale securities, fair value, after 1 year through 5 years | 28,409 |
Available-for-sale securities, fair value, after 5 years through 10 years | 14,188 |
Available-for-sale securities, fair value, after 10 years | 66,679 |
Available-for-sale securities, fair value | $ 112,313 | $ 131,536
Weighted-average yield, GAAP basis, available for sale securities | 2.05% |
Held to maturity securities, amortized cost, 1 year or less | $ 155 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 6,312 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 3,601 |
Held to maturity securities, amortized cost, after 10 years | 10,030 |
Held to maturity securities, amortized cost | 20,098 | $ 1,426
Held-to-maturity securities, fair value, 1 year or less | 157 |
Held-to-maturity securities, fair value, after 1 year through 5 years | 6,318 |
Held-to-maturity securities, fair value, after 5 years through 10 years | 3,624 |
Held-to-maturity securities, fair value, after 10 years | 10,016 |
Held-to-maturity securities, fair value | $ 20,115 |
Weighted-average yield, GAAP basis, held to maturity securities | 1.59% |
1 Year or Less |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.81% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.66% |
After 1 Year through 5 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.23% |
Weighted-average yield, GAAP basis, held to maturity securities | 0.82% |
After 5 Years through 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.89% |
Weighted-average yield, GAAP basis, held to maturity securities | 1.51% |
After 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.45% |
Weighted-average yield, GAAP basis, held to maturity securities | 2.07% |
U.S. Treasury and government agencies |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | $ 2,730 |
Available for sale securities, amortized cost, after 1 year through 5 years | 24,432 |
Available for sale securities, amortized cost, after 5 years through 10 years | 7,505 |
Available for sale securities, amortized cost, after 10 years | 2,205 |
Securities available for sale debt securities, amortized cost | 36,872 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 6,076 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 3,493 |
Held to maturity securities, amortized cost, after 10 years | 422 |
Held to maturity securities, amortized cost | 9,991 |
Residential mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 2 |
Available for sale securities, amortized cost, after 1 year through 5 years | 110 |
Available for sale securities, amortized cost, after 5 years through 10 years | 3,034 |
Available for sale securities, amortized cost, after 10 years | 58,261 |
Securities available for sale debt securities, amortized cost | 61,407 |
Held to maturity securities, amortized cost, after 10 years | 9,548 |
Held to maturity securities, amortized cost | 9,548 |
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 | 1,130 |
Securities available for sale debt securities, amortized cost | 1,132 |
Commercial mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 45 |
Available for sale securities, amortized cost, after 1 year through 5 years | 332 |
Available for sale securities, amortized cost, after 5 years through 10 years | 1,359 |
Available for sale securities, amortized cost, after 10 years | 416 |
Securities available for sale debt securities, amortized cost | 2,152 |
Commercial mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, after 1 year through 5 years | 172 |
Available for sale securities, amortized cost, after 5 years through 10 years | 242 |
Available for sale securities, amortized cost, after 10 years | 3,090 |
Securities available for sale debt securities, amortized cost | 3,504 |
Asset-backed |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 37 |
Available for sale securities, amortized cost, after 1 year through 5 years | 1,803 |
Available for sale securities, amortized cost, after 5 years through 10 years | 1,070 |
Available for sale securities, amortized cost, after 10 years | 3,497 |
Securities available for sale debt securities, amortized cost | 6,407 |
Other |  |
Debt Securities [Line Items] |  |
Available for sale securities, amortized cost, 1 year or less | 216 |
Available for sale securities, amortized cost, after 1 year through 5 years | 2,722 |
Available for sale securities, amortized cost, after 5 years through 10 years | 1,584 |
Available for sale securities, amortized cost, after 10 years | 595 |
Securities available for sale debt securities, amortized cost | 5,117 |
Held to maturity securities, amortized cost, 1 year or less | 155 |
Held to maturity securities, amortized cost, after 1 year through 5 years | 236 |
Held to maturity securities, amortized cost, after 5 years through 10 years | 108 |
Held to maturity securities, amortized cost, after 10 years | 60 |
Held to maturity securities, amortized cost | $ 559 |

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