v3.26.1
Reserves for Insurance Losses and Loss Adjustment Expenses - Schedule of Rollforward of Our Reserves for Insurance Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]            
Total gross reserves for insurance losses and loss adjustment expenses, beginning balance     $ 233 $ 189    
Less: Reinsurance recoverable     69 60    
Net reserves for insurance losses and loss adjustment expenses $ 184 $ 188 184 188 $ 164 $ 129
Current year     342 359    
Prior years     (13) 5    
Total net insurance losses and loss adjustment expenses incurred 208 203 329 364    
Current year     (234) (234)    
Prior years     (75) (71)    
Total net insurance losses and loss adjustment expenses paid or payable     (309) (305)    
Plus: Reinsurance recoverable 67 66 67 66    
Total gross reserves for insurance losses and loss adjustment expenses, ending balance $ 251 $ 254 $ 251 $ 254