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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | $ 3,867 | $ 12,976
Gross Unrealized Losses - Less than 12 Months | (67) | (929)
Estimated Fair Value - 12 Months or More | 9,555 | 5,671
Gross Unrealized Losses - 12 Months or More | (760) | (720)
Estimated Fair Value - Total | 13,422 | 18,647
Gross Unrealized Losses - Total | (827) | (1,649)
Fixed maturities available for sale, at fair value |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 3,565 | 12,739
Gross Unrealized Losses - Less than 12 Months | (65) | (927)
Estimated Fair Value - 12 Months or More | 9,555 | 5,671
Gross Unrealized Losses - 12 Months or More | (760) | (720)
Estimated Fair Value - Total | 13,120 | 18,410
Gross Unrealized Losses - Total | (825) | (1,647)
Corporate bonds |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 1,559 | 4,823
Gross Unrealized Losses - Less than 12 Months | (45) | (393)
Estimated Fair Value - 12 Months or More | 4,959 | 2,559
Gross Unrealized Losses - 12 Months or More | (419) | (388)
Estimated Fair Value - Total | 6,518 | 7,382
Gross Unrealized Losses - Total | (464) | (781)
US government and government agencies |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 1,066 | 3,557
Gross Unrealized Losses - Less than 12 Months | (10) | (197)
Estimated Fair Value - 12 Months or More | 941 | 1,443
Gross Unrealized Losses - 12 Months or More | (76) | (146)
Estimated Fair Value - Total | 2,007 | 5,000
Gross Unrealized Losses - Total | (86) | (343)
Non-US government securities |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 365 | 1,703
Gross Unrealized Losses - Less than 12 Months | (4) | (154)
Estimated Fair Value - 12 Months or More | 897 | 542
Gross Unrealized Losses - 12 Months or More | (96) | (84)
Estimated Fair Value - Total | 1,262 | 2,245
Gross Unrealized Losses - Total | (100) | (238)
Mortgage backed securities |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 221 | 546
Gross Unrealized Losses - Less than 12 Months | (3) | (52)
Estimated Fair Value - 12 Months or More | 522 | 154
Gross Unrealized Losses - 12 Months or More | (63) | (35)
Estimated Fair Value - Total | 743 | 700
Gross Unrealized Losses - Total | (66) | (87)
Asset backed securities |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 234 | 1,148
Gross Unrealized Losses - Less than 12 Months | (1) | (66)
Estimated Fair Value - 12 Months or More | 1,112 | 512
Gross Unrealized Losses - 12 Months or More | (54) | (41)
Estimated Fair Value - Total | 1,346 | 1,660
Gross Unrealized Losses - Total | (55) | (107)
Commercial mortgage backed securities |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 100 | 598
Gross Unrealized Losses - Less than 12 Months | (1) | (35)
Estimated Fair Value - 12 Months or More | 909 | 445
Gross Unrealized Losses - 12 Months or More | (33) | (23)
Estimated Fair Value - Total | 1,009 | 1,043
Gross Unrealized Losses - Total | (34) | (58)
Municipal bonds |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 20 | 364
Gross Unrealized Losses - Less than 12 Months | (1) | (30)
Estimated Fair Value - 12 Months or More | 215 | 16
Gross Unrealized Losses - 12 Months or More | (19) | (3)
Estimated Fair Value - Total | 235 | 380
Gross Unrealized Losses - Total | (20) | (33)
Short-term investments |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 302 | 237
Gross Unrealized Losses - Less than 12 Months | (2) | (2)
Estimated Fair Value - 12 Months or More | 0 | 0
Gross Unrealized Losses - 12 Months or More | 0 | 0
Estimated Fair Value - Total | 302 | 237
Gross Unrealized Losses - Total | $ (2) | $ (2)

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