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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Allowance for expected credit losses        
Balance at beginning of period     $ 22  
Balance at end of period $ 28   28  
Fixed maturities        
Allowance for expected credit losses        
Balance at beginning of period 21 $ 32 22 $ 28
Additions for current-period provision for expected credit losses 2 0 5 0
Additions (reductions) for previously recognized expected credit losses 7 (3) 4 2
Reductions due to disposals (2) (2) (3) (3)
Balance at end of period 28 27 28 27
Structured securities        
Allowance for expected credit losses        
Balance at beginning of period [1] 8 7 9 7
Additions for current-period provision for expected credit losses [1] 0 0 3 0
Additions (reductions) for previously recognized expected credit losses [1] 2 3 (2) 3
Reductions due to disposals [1] 0 0 0 0
Balance at end of period [1] 10 10 10 10
Corporate bonds        
Allowance for expected credit losses        
Balance at beginning of period 12 24 12 20
Additions for current-period provision for expected credit losses 2 0 2 0
Additions (reductions) for previously recognized expected credit losses 4 (6) 5 (1)
Reductions due to disposals (2) (2) (3) (3)
Balance at end of period 16 16 16 16
Non-U.S. government securities        
Allowance for expected credit losses        
Balance at beginning of period 1 1 1 1
Additions for current-period provision for expected credit losses 0 0 0 0
Additions (reductions) for previously recognized expected credit losses 1 0 1 0
Reductions due to disposals 0 0 0 0
Balance at end of period $ 2 $ 1 $ 2 $ 1
[1] Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.