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Securities - Securities by Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |
Amortized Cost of Securities Available for sale, Due in one year or less | $ 490 |
Amortized Cost of Securities Available for sale, Due after one through five years | 17,438 |
Amortized Cost of Securities Available for sale, Due after five through ten years | 3,756 |
Amortized Cost of Securities Available for sale, Due after ten years | 8 |
Amortized Cost | 21,692 | $ 19,917
Fair Value of Securities Available for sale, Due in one year or less | 494 |
Fair Value of Securities Available for sale, Due after one through five years | 17,486 |
Fair Value of Securities Available for sale, Due after five through ten years | 3,856 |
Fair Value of Securities Available for sale, Due after ten years | 7 |
Total Fair Value of Securities Available-for-sale | 21,843 | 19,428
Amortized Cost of Held-to-Maturity Securities, Due in one year or less | 66 |
Amortized Cost of Held-to-Maturity Securities, Due after one through five years | 7,173 |
Amortized Cost of Held-to-Maturity Securities, Due after five through ten years | 2,828 |
Amortized Cost of Held-to-Maturity Securities, Due after ten years | 0 |
Amortized Cost | 10,067 | 11,519
Fair Value of Held-to-Maturity Securities, Due in one year or less | 66 |
Fair Value of Held-to-Maturity Securities, Due after one through five years | 7,178 |
Fair Value of Held-to-Maturity Securities, Due after five through ten years | 2,872 |
Fair Value of Held-to-Maturity Securities, Due after ten years | 0 |
Total Fair Value of Held-to-Maturity Securities | $ 10,116 | $ 11,122

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