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Investment Securities (Contractual Maturity of Debt Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | $ 2,018 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 16,701 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 10,964 |
Available for Sale Securities, Amortized Cost, After 10 years | 54,489 |
Securities available for sale debt securities, amortized cost | 84,172 | $ 67,790
Available-for-sale Securities, Fair value, 1 year or less | 2,038 |
Available-for-sale Securities, Fair value, After 1 year through 5 years | 17,283 |
Available-for-sale Securities, Fair value, After 5 years through 10 years | 11,443 |
Available-for-sale Securities, Fair Value, After 10 years | 56,594 |
Available-for-sale Securities, Fair Value | $ 87,358 | 69,163
Weighted-average yield, GAAP basis, available for sale securities | 2.45% |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | $ 34 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 621 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 421 |
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost | 365 |
Held-to-maturity, debt securities | 1,441 | 17,661
Held-to-maturity Securities, Fair Value, 1 year or less | 35 |
Held-to-maturity Securities, Fair Value, After 1 year through 5 years | 659 |
Held-to-maturity, Securities, Fair Value, After 5 through 10 years | 507 |
Held-to-maturity, Securities, Fair Value, After 10 years | 404 |
Debt Securities, Held-to-maturity, Fair Value | $ 1,605 | $ 18,044
Weighted-average yield, GAAP basis, held to maturity securities | 3.29% |
One Year or Less |  |
Debt Securities, Available-for-sale [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.20% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.75% |
After One Year Through Five Years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.81% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.26% |
After Five Years Through Ten Years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 1.74% |
Weighted-average yield, GAAP basis, held to maturity securities | 3.93% |
After Ten Years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Weighted-average yield, GAAP basis, available for sale securities | 2.80% |
Weighted-average yield, GAAP basis, held to maturity securities | 2.48% |
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | $ 1,149 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 11,973 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 5,418 |
Available for Sale Securities, Amortized Cost, After 10 years | 1,281 |
Securities available for sale debt securities, amortized cost | 19,821 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 199 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 312 |
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost | 284 |
Held-to-maturity, debt securities | 795 |
Residential mortgage-backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [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 | 205 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 2,384 |
Available for Sale Securities, Amortized Cost, After 10 years | 44,765 |
Securities available for sale debt securities, amortized cost | 47,355 |
Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, After 10 years | 1,272 |
Securities available for sale debt securities, amortized cost | 1,272 |
Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 13 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 563 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 679 |
Available for Sale Securities, Amortized Cost, After 10 years | 1,316 |
Securities available for sale debt securities, amortized cost | 2,571 |
Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 83 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 236 |
Available for Sale Securities, Amortized Cost, After 10 years | 3,359 |
Securities available for sale debt securities, amortized cost | 3,678 |
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 67 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 2,375 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 1,029 |
Available for Sale Securities, Amortized Cost, After 10 years | 1,589 |
Securities available for sale debt securities, amortized cost | 5,060 |
Other debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available for Sale Securities, Amortized Cost, 1 year or less | 788 |
Available for Sale Securities, Amortized Cost, After 1 year through 5 years | 1,502 |
Available for Sale Securities, Amortized Cost, After 5 years through 10 years | 1,218 |
Available for Sale Securities, Amortized Cost, After 10 years | 907 |
Securities available for sale debt securities, amortized cost | 4,415 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 34 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 422 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 109 |
Debt Securities, Held-to-maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost | 81 |
Held-to-maturity, debt securities | $ 646 |

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