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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, 2024 | Dec. 31, 2023
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Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | $ 11,377 | $ 5,619
Less Than 12 Months, Gross Unrealized Losses | (137) | (49)
Greater Than 12 Months, Fair Value | 28,841 | 28,107
Greater Than 12 Months, Gross Unrealized Losses | (2,863) | (2,641)
Total, Fair Value | 40,218 | 33,726
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3,000) | (2,690)
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,187 | 1,270
Less Than 12 Months, Gross Unrealized Losses | (9) | (7)
Greater Than 12 Months, Fair Value | 2,773 | 2,077
Greater Than 12 Months, Gross Unrealized Losses | (255) | (227)
Total, Fair Value | 3,960 | 3,347
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (264) | (234)
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 1,942 | 907
Less Than 12 Months, Gross Unrealized Losses | (30) | (7)
Greater Than 12 Months, Fair Value | 4,584 | 4,063
Greater Than 12 Months, Gross Unrealized Losses | (367) | (315)
Total, Fair Value | 6,526 | 4,970
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (397) | (322)
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 5,334 | 1,826
Less Than 12 Months, Gross Unrealized Losses | (49) | (17)
Greater Than 12 Months, Fair Value | 13,570 | 14,696
Greater Than 12 Months, Gross Unrealized Losses | (1,173) | (1,169)
Total, Fair Value | 18,904 | 16,522
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,222) | (1,186)
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 2,511 | 1,337
Less Than 12 Months, Gross Unrealized Losses | (45) | (12)
Greater Than 12 Months, Fair Value | 5,757 | 5,069
Greater Than 12 Months, Gross Unrealized Losses | (854) | (696)
Total, Fair Value | 8,268 | 6,406
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (899) | (708)
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less Than 12 Months, Fair Value | 403 | 279
Less Than 12 Months, Gross Unrealized Losses | (4) | (6)
Greater Than 12 Months, Fair Value | 2,157 | 2,202
Greater Than 12 Months, Gross Unrealized Losses | (214) | (234)
Total, Fair Value | 2,560 | 2,481
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (218) | $ (240)

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