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Schedule IV - Reinsurance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Gross Amount $ 10,250 $ 10,056 $ 9,652
Ceded to other Companies (6,402) (5,779) (4,935)
Assumed From Other Companies 12,628 11,455 8,751
Net Amount $ 16,476 $ 15,732 $ 13,468
Percentage of Amount Assumed to Net 76.60% 72.80% 65.00%
Operating segments | Insurance      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Gross Amount $ 8,268 $ 7,970 $ 7,865
Ceded to other Companies [1],[2] (2,637) (2,179) (2,049)
Assumed From Other Companies [1] 2,167 1,083 46
Net Amount $ 7,798 $ 6,874 $ 5,862
Percentage of Amount Assumed to Net 27.80% 15.80% 0.80%
Operating segments | Reinsurance      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Gross Amount $ 895 $ 956 $ 626
Ceded to other Companies [1],[2] (3,531) (3,366) (2,559)
Assumed From Other Companies [1] 10,254 10,156 8,487
Net Amount $ 7,618 $ 7,746 $ 6,554
Percentage of Amount Assumed to Net 134.60% 131.10% 129.50%
Operating segments | Mortgage      
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]      
Gross Amount $ 1,087 $ 1,130 $ 1,161
Ceded to other Companies [1],[2] (245) (239) (335)
Assumed From Other Companies [1] 218 221 226
Net Amount $ 1,060 $ 1,112 $ 1,052
Percentage of Amount Assumed to Net 20.60% 19.90% 21.50%
[1] Certain amounts included in the gross premiums written of each segment are related to intersegment transactions and are included in the gross premiums written of each segment. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.
[2] Certain assumed and ceded amounts related to intersegment transactions are included in individual segment results. Accordingly, the sum of such transactions for each segment does not agree to the total due to eliminations.