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v3.25.1

Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 48,832 | $ 49,815
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 78 | 62
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,463) | (2,958)
Debt Securities, Available-for-sale | 46,447 | 46,919
Held-to-maturity securities, Amortized Cost | 492 | 512
Securities, Held to maturity, Unrecognized Holding Gain | 1 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (4) | (4)
Debt Securities, Held-to-maturity, Fair Value | 489 | 508
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 46,936 | 47,427
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (2,467) | (2,962)
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 79 | 62
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost | 49,324 | 50,327
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale | 46,447 | 46,919
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,276 | 4,600
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 1 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (212) | (274)
Debt Securities, Available-for-sale | 4,065 | 4,327
Held-to-maturity securities, Amortized Cost | 447 | 444
Securities, Held to maturity, Unrecognized Holding Gain | 1 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1) | (2)
Debt Securities, Held-to-maturity, Fair Value | 447 | 442
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,110 | 7,357
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 4 | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (367) | (375)
Debt Securities, Available-for-sale | 6,747 | 6,984
Held-to-maturity securities, Amortized Cost | 27 | 28
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3) | (2)
Debt Securities, Held-to-maturity, Fair Value | 24 | 26
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 24,097 | 24,391
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 65 | 56
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (924) | (1,140)
Debt Securities, Available-for-sale | 23,238 | 23,307
Held-to-maturity securities, Amortized Cost | 18 | 40
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 | 18 | 40
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 10,410 | 10,577
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 5 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (812) | (994)
Debt Securities, Available-for-sale | 9,603 | 9,584
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,939 | 2,890
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 3 | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (148) | (175)
Debt Securities, Available-for-sale | $ 2,794 | $ 2,717

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