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Investments - Changes in Allowance for Expected Credit Losses on Mortgage Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance $ 66 $ 42
Provision (expense) benefit for loan losses (4) (27)
Loans charged-off 0 3
Ending Balance 70 66
Residential Mortgage    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 54 32
Provision (expense) benefit for loan losses 1 (22)
Loans charged-off 0 0
Ending Balance 53 54
Commercial Mortgage    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 12 10
Provision (expense) benefit for loan losses (5) (5)
Loans charged-off 0 3
Ending Balance $ 17 $ 12