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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Balance at beginning of period $ 28  
Balance at end of period 22 $ 28
Fixed maturities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Balance at beginning of period 28 41
Additions for current-period provision for expected credit losses 0 7
Additions (reductions) for previously recognized expected credit losses 0 (10)
Reductions due to disposals (6) (10)
Balance at end of period 22 28
Structured securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Balance at beginning of period [1] 7 9
Additions for current-period provision for expected credit losses [1] 0 2
Additions (reductions) for previously recognized expected credit losses [1] 3 (3)
Reductions due to disposals [1] (1) (1)
Balance at end of period [1] 9 7
Non-US government securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]    
Balance at beginning of period 1 2
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 (1)
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 20 30
Additions for current-period provision for expected credit losses 0 5
Additions (reductions) for previously recognized expected credit losses (3) (7)
Reductions due to disposals (5) (8)
Balance at end of period $ 12 $ 20
[1] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.