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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 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 15,095 | $ 16,677
Less Than 12 Months, Gross Unrealized Losses | (359) | (518)
Greater Than 12 Months, Fair Value | 23,204 | 24,223
Greater Than 12 Months, Gross Unrealized Losses | (2,104) | (2,440)
Total, Fair Value | 38,299 | 40,900
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,463) | (2,958)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,540 | 1,475
Less Than 12 Months, Gross Unrealized Losses | (28) | (51)
Greater Than 12 Months, Fair Value | 1,944 | 2,152
Greater Than 12 Months, Gross Unrealized Losses | (184) | (223)
Total, Fair Value | 3,484 | 3,627
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (212) | (274)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,111 | 2,593
Less Than 12 Months, Gross Unrealized Losses | (67) | (58)
Greater Than 12 Months, Fair Value | 4,150 | 4,085
Greater Than 12 Months, Gross Unrealized Losses | (300) | (317)
Total, Fair Value | 6,261 | 6,678
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (367) | (375)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 6,855 | 7,402
Less Than 12 Months, Gross Unrealized Losses | (146) | (213)
Greater Than 12 Months, Fair Value | 10,705 | 11,449
Greater Than 12 Months, Gross Unrealized Losses | (778) | (927)
Total, Fair Value | 17,560 | 18,851
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (924) | (1,140)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 4,032 | 4,791
Less Than 12 Months, Gross Unrealized Losses | (114) | (191)
Greater Than 12 Months, Fair Value | 4,660 | 4,674
Greater Than 12 Months, Gross Unrealized Losses | (698) | (803)
Total, Fair Value | 8,692 | 9,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (812) | (994)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 557 | 416
Less Than 12 Months, Gross Unrealized Losses | (4) | (5)
Greater Than 12 Months, Fair Value | 1,745 | 1,863
Greater Than 12 Months, Gross Unrealized Losses | (144) | (170)
Total, Fair Value | 2,302 | 2,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (148) | $ (175)

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