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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

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