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Schedule V (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Allowance for premiums and insurances balances receivable |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, Beginning of year | $ 138 | $ 168 | $ 184
Charged to Costs and Expenses | 1 | (7) | 0
Write Offs | (12) | (28) | (15)
Other Changes | 0 | 5 | (1)
Balance, End of year | 127 | 138 | 168
Federal and foreign valuation allowance for deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, Beginning of year | 1,745 | 2,594 | 1,890
Charged to Costs and Expenses | (31) | (365) | (174)
Write Offs | 0 | 0 | 0
Other Changes | (64) | (484) | 878
Balance, End of year | $ 1,650 | $ 1,745 | $ 2,594

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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