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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months $ 9,850 $ 3,867
Estimated Fair Value - 12 Months or More 7,577 9,555
Estimated Fair Value 17,427 13,422
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (119) (67)
Gross Unrealized Losses - 12 Months or More (678) (760)
Gross Unrealized Losses (797) (827)
Fixed maturities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 9,473 3,565
Estimated Fair Value - 12 Months or More 7,577 9,555
Estimated Fair Value 17,050 13,120
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (118) (65)
Gross Unrealized Losses - 12 Months or More (678) (760)
Gross Unrealized Losses (796) (825)
Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 4,542 1,559
Estimated Fair Value - 12 Months or More 4,006 4,959
Estimated Fair Value 8,548 6,518
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (65) (45)
Gross Unrealized Losses - 12 Months or More (365) (419)
Gross Unrealized Losses (430) (464)
U.S. government and government agencies    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 3,251 1,066
Estimated Fair Value - 12 Months or More 763 941
Estimated Fair Value 4,014 2,007
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (36) (10)
Gross Unrealized Losses - 12 Months or More (70) (76)
Gross Unrealized Losses (106) (86)
Non-U.S. government securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 1,131 365
Estimated Fair Value - 12 Months or More 813 897
Estimated Fair Value 1,944 1,262
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (12) (4)
Gross Unrealized Losses - 12 Months or More (98) (96)
Gross Unrealized Losses (110) (100)
Residential mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 236 221
Estimated Fair Value - 12 Months or More 547 522
Estimated Fair Value 783 743
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (3) (3)
Gross Unrealized Losses - 12 Months or More (68) (63)
Gross Unrealized Losses (71) (66)
Asset backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 104 234
Estimated Fair Value - 12 Months or More 494 1,112
Estimated Fair Value 598 1,346
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (1) (1)
Gross Unrealized Losses - 12 Months or More (34) (54)
Gross Unrealized Losses (35) (55)
Commercial mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 187 100
Estimated Fair Value - 12 Months or More 773 909
Estimated Fair Value 960 1,009
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (1) (1)
Gross Unrealized Losses - 12 Months or More (25) (33)
Gross Unrealized Losses (26) (34)
Municipal bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 22 20
Estimated Fair Value - 12 Months or More 181 215
Estimated Fair Value 203 235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months 0 (1)
Gross Unrealized Losses - 12 Months or More (18) (19)
Gross Unrealized Losses (18) (20)
Short-term investments    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 377 302
Estimated Fair Value - 12 Months or More 0 0
Estimated Fair Value 377 302
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (1) (2)
Gross Unrealized Losses - 12 Months or More 0 0
Gross Unrealized Losses $ (1) $ (2)