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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Allowance for expected credit losses        
Balance at beginning of period     $ 28  
Balance at end of period $ 19   19  
Fixed maturities        
Allowance for expected credit losses        
Balance at beginning of period 27 $ 61 28 $ 41
Additions for current-period provision for expected credit losses   6   7
Additions (reductions) for previously recognized expected credit losses (6) (3) (4) 18
Reductions due to disposals (2) (7) (5) (9)
Balance at end of period 19 57 19 57
Structured securities        
Allowance for expected credit losses        
Balance at beginning of period [1] 10 8 7 9
Additions for current-period provision for expected credit losses [1]   2   2
Additions (reductions) for previously recognized expected credit losses [1] (3) 0 0 (1)
Reductions due to disposals [1] (1) (2) (1) (2)
Balance at end of period [1] 6 8 6 8
Corporate bonds        
Allowance for expected credit losses        
Balance at beginning of period 16 50 20 30
Additions for current-period provision for expected credit losses   4   5
Additions (reductions) for previously recognized expected credit losses (3) (3) (4) 18
Reductions due to disposals (1) (4) (4) (6)
Balance at end of period 12 47 12 47
Non-U.S. government securities        
Allowance for expected credit losses        
Balance at beginning of period 1 3 1 2
Additions for current-period provision for expected credit losses   0   0
Additions (reductions) for previously recognized expected credit losses 0 0 0 1
Reductions due to disposals 0 (1) 0 (1)
Balance at end of period $ 1 $ 2 $ 1 $ 2
[1] Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.