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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 48,683 | $ 49,815
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 131 | 62
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,206) | (2,958)
Debt Securities, Available-for-sale | 46,608 | 46,919
Held-to-maturity securities, Amortized Cost | 493 | 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 | 490 | 508
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value | 47,098 | 47,427
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss | (2,210) | (2,962)
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain | 132 | 62
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost | 49,176 | 50,327
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale | 46,608 | 46,919
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,189 | 4,600
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 3 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (186) | (274)
Debt Securities, Available-for-sale | 4,006 | 4,327
Held-to-maturity securities, Amortized Cost | 448 | 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 | 448 | 442
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,234 | 7,357
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 7 | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (375) | (375)
Debt Securities, Available-for-sale | 6,866 | 6,984
Held-to-maturity securities, Amortized Cost | 26 | 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 | 23 | 26
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 24,044 | 24,391
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 106 | 56
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (735) | (1,140)
Debt Securities, Available-for-sale | 23,415 | 23,307
Held-to-maturity securities, Amortized Cost | 19 | 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 | 19 | 40
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 10,341 | 10,577
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 8 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (783) | (994)
Debt Securities, Available-for-sale | 9,566 | 9,584
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,875 | 2,890
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 7 | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (127) | (175)
Debt Securities, Available-for-sale | $ 2,755 | $ 2,717

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