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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, 2024 | Dec. 31, 2023
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Schedule of Investments [Line Items] |  |
Due in one year or less, Amortized Cost | $ 3,952 |
Due after one year through five years, Amortized Cost | 14,845 |
Due after five years through ten years, Amortized Cost | 12,110 |
Due after ten years, Amortized Cost | 5,441 |
Total debt securities - available-for-sale, Amortized Cost | 49,815 | $ 47,451
Due in one year or less, Fair Value | 3,932 |
Due after one year through five years, Fair Value | 14,384 |
Due after five years through ten years, Fair Value | 11,213 |
Due after ten years, Fair Value | 5,089 |
Debt Securities, Available-for-sale | 46,919 | 44,895
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 320 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 319 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 161 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 161 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 14 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 13 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost | 17 |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 15 |
Debt Securities, Held-to-maturity | 512 | 603
Debt Securities, Held-to-maturity, Fair Value | 508 | 596
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 10,577 |
Total debt securities - available-for-sale, Amortized Cost | 10,577 | 8,982
Debt Securities, Available-for-sale | 9,584 | 8,296
Mortgage-backed securities, Fair Value | 9,584 |
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 2,890 |
Total debt securities - available-for-sale, Amortized Cost | 2,890 | 3,023
Debt Securities, Available-for-sale | 2,717 | $ 2,786
Mortgage-backed securities, Fair Value | $ 2,717 |

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