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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