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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Allowance for expected credit losses    
Balance at beginning of period $ 28  
Balance at end of period 32  
Fixed maturities    
Allowance for expected credit losses    
Balance at beginning of period 28 $ 41
Additions for current-period provision for expected credit losses 0 1
Additions (reductions) for previously recognized expected credit losses 5 15
Reductions due to disposals (1) (1)
Balance at end of period 32 56
Structured securities    
Allowance for expected credit losses    
Balance at beginning of period [1] 7 9
Additions for current-period provision for expected credit losses [1] 0 0
Additions (reductions) for previously recognized expected credit losses [1] 0 (1)
Reductions due to disposals [1] 0 0
Balance at end of period [1] 7 8
Corporate bonds    
Allowance for expected credit losses    
Balance at beginning of period 20 30
Additions for current-period provision for expected credit losses 0 1
Additions (reductions) for previously recognized expected credit losses 5 15
Reductions due to disposals (1) (1)
Balance at end of period 24 45
Non-U.S. government securities    
Allowance for expected credit losses    
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 1
Reductions due to disposals 0 0
Balance at end of period $ 1 $ 3
[1] Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.