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Investments - Fair Value and Gross Unrealized Losses in a Continuous Unrealized Loss Position (Details) security in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
Fair Value |  |
Less Than or Equal to Twelve Months | $ 30,166 | $ 17,427
Greater Than Twelve Months | 36,345 | 44,508
Total | 66,511 | 61,935
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 4,537 | 3,526
Greater Than Twelve Months | 6,468 | 6,241
Total | $ 11,005 | $ 9,767
Total number of fixed maturity AFS securities in an unrealized loss position | security | 6,985 | 7,605
Unrealized holding losses arising during the period | $ 23 | $ 8
Corporate bonds |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 24,657 | 14,005
Greater Than Twelve Months | 29,786 | 34,595
Total | 54,443 | 48,600
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 4,054 | 3,270
Greater Than Twelve Months | 5,601 | 5,002
Total | 9,655 | 8,272
U.S. government bonds |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 86 | 65
Greater Than Twelve Months | 224 | 195
Total | 310 | 260
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 3 | 6
Greater Than Twelve Months | 38 | 23
Total | 41 | 29
State and municipal bonds |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 1,087 | 371
Greater Than Twelve Months | 760 | 874
Total | 1,847 | 1,245
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 228 | 72
Greater Than Twelve Months | 217 | 345
Total | 445 | 417
Foreign government bonds |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 32 | 111
Greater Than Twelve Months | 118 | 57
Total | 150 | 168
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 5 | 31
Greater Than Twelve Months | 51 | 16
Total | 56 | 47
RMBS |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 795 | 360
Greater Than Twelve Months | 760 | 886
Total | 1,555 | 1,246
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 76 | 20
Greater Than Twelve Months | 144 | 177
Total | 220 | 197
CMBS |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 579 | 583
Greater Than Twelve Months | 777 | 589
Total | 1,356 | 1,172
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 50 | 56
Greater Than Twelve Months | 106 | 147
Total | 156 | 203
ABS |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 2,907 | 1,900
Greater Than Twelve Months | 3,827 | 7,217
Total | 6,734 | 9,117
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 118 | 68
Greater Than Twelve Months | 303 | 517
Total | 421 | 585
Hybrid and redeemable preferred securities |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 23 | 32
Greater Than Twelve Months | 93 | 95
Total | 116 | 127
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 3 | 3
Greater Than Twelve Months | 8 | 14
Total | $ 11 | $ 17

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