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v3.25.1

Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Schedule of Investments [Line Items] |  |
Due in one year or less, Amortized Cost | $ 3,693 |
Due after one year through five years, Amortized Cost | 14,251 |
Due after five years through ten years, Amortized Cost | 12,248 |
Due after ten years, Amortized Cost | 5,291 |
Total debt securities - available-for-sale, Amortized Cost | 48,832 | $ 49,815
Due in one year or less, Fair Value | 3,670 |
Due after one year through five years, Fair Value | 13,885 |
Due after five years through ten years, Fair Value | 11,536 |
Due after ten years, Fair Value | 4,959 |
Debt Securities, Available-for-sale | 46,447 | 46,919
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 341 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 120 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 14 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 17 |
Debt Securities, Held-to-maturity | 492 | 512
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value | 341 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 121 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 13 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 14 |
Debt Securities, Held-to-maturity, Fair Value | 489 | 508
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 10,410 |
Total debt securities - available-for-sale, Amortized Cost | 10,410 | 10,577
Mortgage-backed securities, Fair Value | 9,603 |
Debt Securities, Available-for-sale | 9,603 | 9,584
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 2,939 |
Total debt securities - available-for-sale, Amortized Cost | 2,939 | 2,890
Mortgage-backed securities, Fair Value | 2,794 |
Debt Securities, Available-for-sale | $ 2,794 | $ 2,717

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