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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of beginning and ending balances of losses and loss adjustment reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]        
Reserve for losses and loss adjustment expenses at beginning of period $ 30,946 $ 23,705 $ 29,369 $ 22,752
Unpaid losses and loss adjustment expenses recoverable 8,379 7,069 7,821 6,690
Net reserve for losses and loss adjustment expenses at beginning of period 22,567 16,636 21,548 16,062
Net incurred losses and loss adjustment expenses relating to losses occurring in:        
Current year 2,456 1,948 5,240 3,800
Prior years (153) (121) (350) (245)
Total net incurred losses and loss adjustment expenses 2,303 1,827 4,890 3,555
Net losses and loss adjustment expense reserves of acquired business [1] 50 50 50 50
Net foreign exchange (gains) losses and other 400 (10) 593 (94)
Net paid losses and loss adjustment expenses relating to losses occurring in:        
Current year (424) (193) (865) (285)
Prior years (1,320) (927) (2,640) (1,905)
Total net paid losses and loss adjustment expenses (1,744) (1,120) (3,505) (2,190)
Net reserve for losses and loss adjustment expenses at end of period 23,576 17,383 23,576 17,383
Unpaid losses and loss adjustment expenses recoverable 8,513 7,083 8,513 7,083
Reserve for losses and loss adjustment expenses at end of period $ 32,089 $ 24,466 $ 32,089 $ 24,466
[1] Activity in the 2025 periods related to the MCE Acquisition (see note 2). Activity in the 2024 periods related to the acquisition of RMIC Companies, Inc. and its wholly-owned subsidiaries that, together, comprise the run-off mortgage insurance business of Old Republic International Corporation.