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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, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Due in one year or less, Amortized Cost | $ 2,603 |
Due after one year through five years, Amortized Cost | 12,885 |
Due after five years through ten years, Amortized Cost | 11,342 |
Due after ten years, Amortized Cost | 4,152 |
Total debt securities - available-for-sale, Amortized Cost | 39,669 | $ 38,079
Due in one year or less, Fair Value | 2,614 |
Due after one year through five years, Fair Value | 13,065 |
Due after five years through ten years, Fair Value | 11,524 |
Due after ten years, Fair Value | 4,275 |
Debt Securities, Available-for-sale | 40,217 | 39,828
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 235 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 236 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 355 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 354 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 28 |
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 | 23 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 24 |
Debt Securities, Held-to-maturity | 641 | 638
Debt Securities, Held-to-maturity, Fair Value | 643 | 647
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 5,868 |
Total debt securities - available-for-sale, Amortized Cost | 5,868 | 6,849
Debt Securities, Available-for-sale | 5,901 | 7,091
Mortgage-backed securities, Fair Value | 5,901 |
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 2,819 |
Total debt securities - available-for-sale, Amortized Cost | 2,819 | 2,116
Debt Securities, Available-for-sale | 2,838 | $ 2,207
Mortgage-backed securities, Fair Value | $ 2,838 |

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