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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Allowance for expected credit losses        
Balance at beginning of period     $ 41  
Balance at end of period $ 61   61  
Fixed maturities        
Allowance for expected credit losses        
Balance at beginning of period 56 $ 34 41 $ 3
Additions for current-period provision for expected credit losses 0 18 1 49
Additions (reductions) for previously recognized expected credit losses 6 7 21 7
Reductions due to disposals (1) 0 (2) 0
Balance at end of period 61 59 61 59
Fixed maturities | Structured securities        
Allowance for expected credit losses        
Balance at beginning of period [1] 8 7 9 1
Additions for current-period provision for expected credit losses [1] 0 5 0 11
Additions (reductions) for previously recognized expected credit losses [1] 0 7 (1) 7
Reductions due to disposals [1] 0 0 0 0
Balance at end of period [1] 8 19 8 19
Fixed maturities | Non-U.S. government securities        
Allowance for expected credit losses        
Balance at beginning of period 3 0 2 0
Additions for current-period provision for expected credit losses 0 0 0 0
Additions (reductions) for previously recognized expected credit losses 0 0 1 0
Reductions due to disposals 0 0 0 0
Balance at end of period 3 0 3 0
Fixed maturities | Corporate bonds        
Allowance for expected credit losses        
Balance at beginning of period 45 27 30 2
Additions for current-period provision for expected credit losses 0 13 1 38
Additions (reductions) for previously recognized expected credit losses 6 0 21 0
Reductions due to disposals (1) 0 (2) 0
Balance at end of period $ 50 $ 40 $ 50 $ 40
[1] Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.