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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Balance at beginning of period $ 22  
Balance at end of period 20 $ 22
Fixed maturities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Balance at beginning of period 22 28
Additions for current-period provision for expected credit losses 5 0
Additions (reductions) for previously recognized expected credit losses 0 0
Reductions due to disposals (7) (6)
Balance at end of period 20 22
Structured securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Balance at beginning of period [1] 9 7
Additions for current-period provision for expected credit losses [1] 3 0
Additions (reductions) for previously recognized expected credit losses [1] (3) 3
Reductions due to disposals [1] 0 (1)
Balance at end of period [1] 9 9
Non-US government securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Balance at beginning of period 1 1
Additions for current-period provision for expected credit losses 0 0
Additions (reductions) for previously recognized expected credit losses 0 0
Reductions due to disposals 0 0
Balance at end of period 1 1
Corporate bonds    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Balance at beginning of period 12 20
Additions for current-period provision for expected credit losses 2 0
Additions (reductions) for previously recognized expected credit losses 3 (3)
Reductions due to disposals (7) (5)
Balance at end of period $ 10 $ 12
[1] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.