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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 49,815 | $ 47,451
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 62 | 134
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,958) | (2,690)
Debt Securities, Available-for-sale | 46,919 | 44,895
Held-to-maturity securities, Amortized Cost | 512 | 603
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (4) | (8)
Debt Securities, Held-to-maturity, Fair Value | 508 | 596
Total investments, Amortized Cost | 50,327 | 48,054
Total investments, Gross Unrealized Gains | 62 | 135
Total investments, Gross Unrealized Losses | (2,962) | (2,698)
Investments, Fair Value Disclosure | 47,427 | 45,491
Debt Securities - available-for-sale |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale | 46,919 | 44,895
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,600 | 4,674
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 1 | 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (274) | (234)
Debt Securities, Available-for-sale | 4,327 | 4,443
Held-to-maturity securities, Amortized Cost | 444 | 506
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2) | (6)
Debt Securities, Held-to-maturity, Fair Value | 442 | 501
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,357 | 7,636
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 2 | 39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (375) | (322)
Debt Securities, Available-for-sale | 6,984 | 7,353
Held-to-maturity securities, Amortized Cost | 28 | 28
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2) | (2)
Debt Securities, Held-to-maturity, Fair Value | 26 | 26
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 24,391 | 23,136
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 56 | 67
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,140) | (1,186)
Debt Securities, Available-for-sale | 23,307 | 22,017
Held-to-maturity securities, Amortized Cost | 40 | 69
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 40 | 69
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 10,577 | 8,982
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 1 | 22
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (994) | (708)
Debt Securities, Available-for-sale | 9,584 | 8,296
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,890 | 3,023
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 2 | 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (175) | (240)
Debt Securities, Available-for-sale | $ 2,717 | $ 2,786

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