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Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | $ 527 | $ 634 | $ 590
Provision (release) | 249 | 43 | 67
Initial credit losses on PCD loans (1) | 0 | 3 |
Charge-offs, net of recoveries | (55) | (150) | (26)
Balance at December 31, | 721 | 527 | 634
Commercial Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | 218 | 340 | 252
Provision (release) | 168 | (2) | 88
Initial credit losses on PCD loans (1) | 0 | 0 |
Charge-offs, net of recoveries | (19) | (120) | 0
Balance at December 31, | 367 | 218 | 340
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | 190 | 206 | 232
Provision (release) | (8) | (8) | (27)
Initial credit losses on PCD loans (1) | 0 | 3 |
Charge-offs, net of recoveries | 0 | (8) | (2)
Balance at December 31, | 182 | 190 | 206
Agricultural Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | 119 | 88 | 106
Provision (release) | 89 | 53 | 6
Initial credit losses on PCD loans (1) | 0 | 0 |
Charge-offs, net of recoveries | (36) | (22) | (24)
Balance at December 31, | $ 172 | $ 119 | $ 88

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