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Investments - Fair Value and Gross Unrealized Losses in a Continuous Unrealized Loss Position (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
Fair Value |  |
Less Than or Equal to Twelve Months | $ 28,311 | $ 17,427
Greater Than Twelve Months | 42,533 | 44,508
Total | 70,844 | 61,935
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 4,933 | 3,526
Greater Than Twelve Months | 5,648 | 6,241
Total | $ 10,581 | $ 9,767
Total number of fixed maturity AFS securities in an unrealized loss position | security | 7,485 | 7,605
Unrealized holding gains (losses) arising during the period | $ 12 | $ 8
Corporate bonds |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 23,895 | 14,005
Greater Than Twelve Months | 33,636 | 34,595
Total | 57,531 | 48,600
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 4,432 | 3,270
Greater Than Twelve Months | 4,633 | 5,002
Total | 9,065 | 8,272
U.S. government bonds |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 102 | 65
Greater Than Twelve Months | 188 | 195
Total | 290 | 260
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 9 | 6
Greater Than Twelve Months | 26 | 23
Total | 35 | 29
State and municipal bonds |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 894 | 371
Greater Than Twelve Months | 895 | 874
Total | 1,789 | 1,245
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 222 | 72
Greater Than Twelve Months | 178 | 345
Total | 400 | 417
Foreign government bonds |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 107 | 111
Greater Than Twelve Months | 66 | 57
Total | 173 | 168
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 30 | 31
Greater Than Twelve Months | 23 | 16
Total | 53 | 47
RMBS |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 620 | 360
Greater Than Twelve Months | 907 | 886
Total | 1,527 | 1,246
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 76 | 20
Greater Than Twelve Months | 141 | 177
Total | 217 | 197
CMBS |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 677 | 583
Greater Than Twelve Months | 621 | 589
Total | 1,298 | 1,172
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 70 | 56
Greater Than Twelve Months | 108 | 147
Total | 178 | 203
ABS |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 1,998 | 1,900
Greater Than Twelve Months | 6,118 | 7,217
Total | 8,116 | 9,117
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 91 | 68
Greater Than Twelve Months | 530 | 517
Total | 621 | 585
Hybrid and redeemable preferred securities |  |
Fair Value |  |
Less Than or Equal to Twelve Months | 18 | 32
Greater Than Twelve Months | 102 | 95
Total | 120 | 127
Gross Unrealized Losses |  |
Less Than or Equal to Twelve Months | 3 | 3
Greater Than Twelve Months | 9 | 14
Total | $ 12 | $ 17

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