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Investment Securities (Contractual Maturity of Securities) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | $ 3,506 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 20,264 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 12,305 |
Available for Sale Securities, Amortized Cost, After 10 years | 58,731 |
Securities available for sale debt securities, amortized cost | 94,806 | $ 84,172
Available-for-sale Securities, Fair value, 1 year or less | 3,529 |
Available-for-sale Securities, Fair value, After 1 year through 5 years | 20,700 |
Available-for-sale Securities, Fair value, After 5 years through 10 years | 12,405 |
Available-for-sale Securities, Fair value, After 10 years | 60,165 |
Available-for-sale securities, fair value | $ 96,799 | 87,358
Weighted-average yield, GAAP basis, available for sale securities | 2.25% |
Held to Maturity Securities, Amortized Cost, 1 year or less | $ 71 |
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years | 595 |
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years | 424 |
Held to Maturity Securities, Amortized Cost, After 10 years | 366 |
Held to maturity securities, amortized cost | 1,456 | 1,441
Held-to-maturity Securities, Fair Value, 1 year or less | 72 |
Held-to-maturity Securities, Fair Value, After 1 year through 5 years | 626 |
Held-to-maturity Securities, Fair Value, After 5 years through 10 years | 490 |
Held-to-maturity Securities, Fair Value, After 10 years | 371 |
Held-to-maturity Securities, Debt Maturities, Fair Value, Total | $ 1,559 | $ 1,605
Weighted-average yield, GAAP basis, held to maturity securities | 3.28% |
1 Year or Less |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.68% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.70% |
After 1 Year through 5 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.58% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.21% |
After 5 Years through 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.72% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.93% |
After 10 Years |  |
Debt Securities [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.62% |
Weighted-average yield, GAAP basis, held to maturity securities | 2.48% |
U.S. Treasury and government agencies |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | $ 2,685 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 15,164 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 6,237 |
Available for Sale Securities, Amortized Cost, After 10 years | 1,584 |
Securities available for sale debt securities, amortized cost | 25,670 |
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 | 315 |
Held to Maturity Securities, Amortized Cost, After 10 years | 286 |
Held to maturity securities, amortized cost | 800 |
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 | 205 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 2,248 |
Available for Sale Securities, Amortized Cost, After 10 years | 48,044 |
Securities available for sale debt securities, amortized cost | 50,499 |
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 | 1,179 |
Securities available for sale debt securities, amortized cost | 1,181 |
Commercial mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 545 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 662 |
Available for Sale Securities, Amortized Cost, After 10 years | 1,012 |
Securities available for sale debt securities, amortized cost | 2,219 |
Commercial mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 202 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 210 |
Available for Sale Securities, Amortized Cost, After 10 years | 3,779 |
Securities available for sale debt securities, amortized cost | 4,191 |
Asset-backed |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 86 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 2,322 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 1,274 |
Available for Sale Securities, Amortized Cost, After 10 years | 2,287 |
Securities available for sale debt securities, amortized cost | 5,969 |
Other |  |
Debt Securities [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 733 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 1,826 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 1,672 |
Available for Sale Securities, Amortized Cost, After 10 years | 846 |
Securities available for sale debt securities, amortized cost | 5,077 |
Held to Maturity Securities, Amortized Cost, 1 year or less | 71 |
Held to Maturity Securities, Amortized Cost, After 1 year through 5 years | 396 |
Held to Maturity Securities, Amortized Cost, After 5 years through 10 years | 109 |
Held to Maturity Securities, Amortized Cost, After 10 years | 80 |
Held to maturity securities, amortized cost | $ 656 |

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