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Investments (Fair Value of Available-For-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time That Individual Securities Have Been in a Continuous Unrealized Loss Position) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 12,695 | $ 16,677
Less Than 12 Months, Gross Unrealized Losses | (306) | (518)
Greater Than 12 Months, Fair Value | 22,281 | 24,223
Greater Than 12 Months, Gross Unrealized Losses | (1,900) | (2,440)
Total, Fair Value | 34,976 | 40,900
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,206) | (2,958)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,377 | 1,475
Less Than 12 Months, Gross Unrealized Losses | (21) | (51)
Greater Than 12 Months, Fair Value | 1,833 | 2,152
Greater Than 12 Months, Gross Unrealized Losses | (165) | (223)
Total, Fair Value | 3,210 | 3,627
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (186) | (274)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,116 | 2,593
Less Than 12 Months, Gross Unrealized Losses | (93) | (58)
Greater Than 12 Months, Fair Value | 4,037 | 4,085
Greater Than 12 Months, Gross Unrealized Losses | (282) | (317)
Total, Fair Value | 6,153 | 6,678
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (375) | (375)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 4,988 | 7,402
Less Than 12 Months, Gross Unrealized Losses | (80) | (213)
Greater Than 12 Months, Fair Value | 10,214 | 11,449
Greater Than 12 Months, Gross Unrealized Losses | (655) | (927)
Total, Fair Value | 15,202 | 18,851
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (735) | (1,140)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 3,914 | 4,791
Less Than 12 Months, Gross Unrealized Losses | (110) | (191)
Greater Than 12 Months, Fair Value | 4,561 | 4,674
Greater Than 12 Months, Gross Unrealized Losses | (673) | (803)
Total, Fair Value | 8,475 | 9,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (783) | (994)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 300 | 416
Less Than 12 Months, Gross Unrealized Losses | (2) | (5)
Greater Than 12 Months, Fair Value | 1,636 | 1,863
Greater Than 12 Months, Gross Unrealized Losses | (125) | (170)
Total, Fair Value | 1,936 | 2,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (127) | $ (175)

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