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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Due in one year or less, Amortized Cost | $ 2,951 |
Due after one year through five years, Amortized Cost | 11,638 |
Due after five years through ten years, Amortized Cost | 10,212 |
Due after ten years, Amortized Cost | 4,313 |
Total debt securities - available-for-sale, Amortized Cost | 38,079 | $ 35,328
Due in one year or less, Fair Value | 2,966 |
Due after one year through five years, Fair Value | 12,088 |
Due after five years through ten years, Fair Value | 10,931 |
Due after ten years, Fair Value | 4,545 |
Debt Securities, Available-for-sale | 39,828 | 36,094
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 348 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 349 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 241 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 245 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 27 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 29 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost | 22 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 24 |
Debt Securities, Held-to-maturity | 638 | 972
Debt Securities, Held-to-maturity, Fair Value | 647 | 975
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 6,849 |
Total debt securities - available-for-sale, Amortized Cost | 6,849 | 6,425
Debt Securities, Available-for-sale | 7,091 | 6,528
Mortgage-backed securities, Fair Value | 7,091 |
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 2,116 |
Total debt securities - available-for-sale, Amortized Cost | 2,116 | 1,811
Debt Securities, Available-for-sale | 2,207 | $ 1,845
Mortgage-backed securities, Fair Value | $ 2,207 |

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