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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months $ 10,776 $ 12,976
Estimated Fair Value - 12 Months or More 10,449 5,671
Estimated Fair Value 21,225 18,647
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (287) (929)
Gross Unrealized Losses - 12 Months or More (1,128) (720)
Gross Unrealized Losses (1,415) (1,649)
Fixed maturities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 10,584 12,739
Estimated Fair Value - 12 Months or More 10,449 5,671
Estimated Fair Value 21,033 18,410
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (286) (927)
Gross Unrealized Losses - 12 Months or More (1,128) (720)
Gross Unrealized Losses (1,414) (1,647)
Fixed maturities | Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 4,813 4,823
Estimated Fair Value - 12 Months or More 5,272 2,559
Estimated Fair Value 10,085 7,382
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (141) (393)
Gross Unrealized Losses - 12 Months or More (606) (388)
Gross Unrealized Losses (747) (781)
Fixed maturities | 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 3,922 3,557
Estimated Fair Value - 12 Months or More 1,294 1,443
Estimated Fair Value 5,216 5,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (93) (197)
Gross Unrealized Losses - 12 Months or More (147) (146)
Gross Unrealized Losses (240) (343)
Fixed maturities | Non-U.S. government securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 1,002 1,703
Estimated Fair Value - 12 Months or More 956 542
Estimated Fair Value 1,958 2,245
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (25) (154)
Gross Unrealized Losses - 12 Months or More (148) (84)
Gross Unrealized Losses (173) (238)
Fixed maturities | Residential mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 420 546
Estimated Fair Value - 12 Months or More 521 154
Estimated Fair Value 941 700
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (15) (52)
Gross Unrealized Losses - 12 Months or More (85) (35)
Gross Unrealized Losses (100) (87)
Fixed maturities | Asset backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 190 1,148
Estimated Fair Value - 12 Months or More 1,287 512
Estimated Fair Value 1,477 1,660
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (4) (66)
Gross Unrealized Losses - 12 Months or More (72) (41)
Gross Unrealized Losses (76) (107)
Fixed maturities | Commercial mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 153 598
Estimated Fair Value - 12 Months or More 907 445
Estimated Fair Value 1,060 1,043
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (3) (35)
Gross Unrealized Losses - 12 Months or More (43) (23)
Gross Unrealized Losses (46) (58)
Fixed maturities | Municipal bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 84 364
Estimated Fair Value - 12 Months or More 212 16
Estimated Fair Value 296 380
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (5) (30)
Gross Unrealized Losses - 12 Months or More (27) (3)
Gross Unrealized Losses (32) (33)
Short-term investments    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 192 237
Estimated Fair Value - 12 Months or More 0 0
Estimated Fair Value 192 237
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)