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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, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Due in one year or less, Amortized Cost | $ 4,713 |
Due after one year through five years, Amortized Cost | 13,135 |
Due after five years through ten years, Amortized Cost | 12,210 |
Due after ten years, Amortized Cost | 5,412 |
Total debt securities - available-for-sale, Amortized Cost | 45,926 | $ 39,669
Due in one year or less, Fair Value | 4,682 |
Due after one year through five years, Fair Value | 12,404 |
Due after five years through ten years, Fair Value | 10,897 |
Due after ten years, Fair Value | 4,968 |
Debt Securities, Available-for-sale | 42,321 | 40,217
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 374 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 369 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 265 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 256 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 37 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 36 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost | 20 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 18 |
Debt Securities, Held-to-maturity | 696 | 641
Debt Securities, Held-to-maturity, Fair Value | 679 | 643
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 7,379 |
Total debt securities - available-for-sale, Amortized Cost | 7,379 | 5,868
Debt Securities, Available-for-sale | 6,586 | 5,901
Mortgage-backed securities, Fair Value | 6,586 |
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 3,077 |
Total debt securities - available-for-sale, Amortized Cost | 3,077 | 2,819
Debt Securities, Available-for-sale | 2,784 | $ 2,838
Mortgage-backed securities, Fair Value | $ 2,784 |

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