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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Allowance for expected credit losses    
Balance at beginning of period $ 41  
Balance at end of period 56  
Fixed maturities    
Allowance for expected credit losses    
Balance at beginning of period 41 $ 3
Additions for current-period provision for expected credit losses 1 31
Additions (reductions) for previously recognized expected credit losses 15 0
Reductions due to disposals (1) 0
Balance at end of period 56 34
Fixed maturities | Structured securities    
Allowance for expected credit losses    
Balance at beginning of period [1] 9 1
Additions for current-period provision for expected credit losses [1] 0 6
Additions (reductions) for previously recognized expected credit losses [1] (1) 0
Reductions due to disposals [1] 0 0
Balance at end of period [1] 8 7
Fixed maturities | Non-U.S. government securities    
Allowance for expected credit losses    
Balance at beginning of period 2 0
Additions for current-period provision for expected credit losses 0 0
Additions (reductions) for previously recognized expected credit losses 1 0
Reductions due to disposals 0 0
Balance at end of period 3 0
Fixed maturities | Corporate bonds    
Allowance for expected credit losses    
Balance at beginning of period 30 2
Additions for current-period provision for expected credit losses 1 25
Additions (reductions) for previously recognized expected credit losses 15 0
Reductions due to disposals (1) 0
Balance at end of period $ 45 $ 27
[1] Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.