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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Schedule of Investments [Line Items] |  |
Due in one year or less, Amortized Cost | $ 3,334 |
Due after one year through five years, Amortized Cost | 14,106 |
Due after five years through ten years, Amortized Cost | 12,664 |
Due after ten years, Amortized Cost | 7,685 |
Total debt securities - available-for-sale, Amortized Cost | 51,867 | $ 49,578
Due in one year or less, Fair Value | 3,316 |
Due after one year through five years, Fair Value | 13,770 |
Due after five years through ten years, Fair Value | 12,254 |
Due after ten years, Fair Value | 7,414 |
Debt Securities, Available-for-sale | 50,106 | 48,182
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 267 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 186 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 4 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 17 |
Debt Securities, Held-to-maturity | 474 | 490
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value | 268 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 185 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 4 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 14 |
Debt Securities, Held-to-maturity, Fair Value | 471 | 489
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 10,901 |
Total debt securities - available-for-sale, Amortized Cost | 10,901 | 10,284
Mortgage-backed securities, Fair Value | 10,275 |
Debt Securities, Available-for-sale | 10,275 | 9,719
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 3,177 |
Total debt securities - available-for-sale, Amortized Cost | 3,177 | 2,748
Mortgage-backed securities, Fair Value | 3,077 |
Debt Securities, Available-for-sale | $ 3,077 | $ 2,660

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