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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months $ 5,283 $ 3,867
Estimated Fair Value - 12 Months or More 6,386 9,555
Estimated Fair Value 11,669 13,422
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (102) (67)
Gross Unrealized Losses - 12 Months or More (431) (760)
Gross Unrealized Losses (533) (827)
Fixed maturities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 4,921 3,565
Estimated Fair Value - 12 Months or More 6,386 9,555
Estimated Fair Value 11,307 13,120
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (100) (65)
Gross Unrealized Losses - 12 Months or More (431) (760)
Gross Unrealized Losses (531) (825)
Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 1,903 1,559
Estimated Fair Value - 12 Months or More 3,316 4,959
Estimated Fair Value 5,219 6,518
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (76) (45)
Gross Unrealized Losses - 12 Months or More (218) (419)
Gross Unrealized Losses (294) (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 1,815 1,066
Estimated Fair Value - 12 Months or More 571 941
Estimated Fair Value 2,386 2,007
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (10) (10)
Gross Unrealized Losses - 12 Months or More (38) (76)
Gross Unrealized Losses (48) (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 614 365
Estimated Fair Value - 12 Months or More 743 897
Estimated Fair Value 1,357 1,262
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (8) (4)
Gross Unrealized Losses - 12 Months or More (76) (96)
Gross Unrealized Losses (84) (100)
Residential mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 213 221
Estimated Fair Value - 12 Months or More 485 522
Estimated Fair Value 698 743
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (2) (3)
Gross Unrealized Losses - 12 Months or More (48) (63)
Gross Unrealized Losses (50) (66)
Asset backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 199 234
Estimated Fair Value - 12 Months or More 442 1,112
Estimated Fair Value 641 1,346
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (3) (1)
Gross Unrealized Losses - 12 Months or More (24) (54)
Gross Unrealized Losses (27) (55)
Commercial mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 176 100
Estimated Fair Value - 12 Months or More 644 909
Estimated Fair Value 820 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 (16) (33)
Gross Unrealized Losses (17) (34)
Municipal bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 1 20
Estimated Fair Value - 12 Months or More 185 215
Estimated Fair Value 186 235
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 (11) (19)
Gross Unrealized Losses (11) (20)
Short-term investments    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 362 302
Estimated Fair Value - 12 Months or More 0 0
Estimated Fair Value 362 302
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (2) (2)
Gross Unrealized Losses - 12 Months or More 0 0
Gross Unrealized Losses $ (2) $ (2)