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Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period $ 721 $ 527
Provision (release) 231 201
Charge-offs, net of recoveries (105) (23)
Balance, end of period 847 705
Commercial Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 367 218
Provision (release) 212 147
Charge-offs, net of recoveries (28) (10)
Balance, end of period 551 355
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 182 190
Provision (release) (21) 2
Charge-offs, net of recoveries 0 0
Balance, end of period 161 192
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 172 119
Provision (release) 40 52
Charge-offs, net of recoveries (77) (13)
Balance, end of period $ 135 $ 158