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Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | $ 721 | $ 527 | $ 634
Provision (release) (1) | 229 | 249 | 43
Charge-offs, net of recoveries | (150) | (55) | (150)
Balance at December 31, | 800 | 721 | 527
Commercial Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | 367 | 218 | 340
Provision (release) (1) | 198 | 168 | (2)
Charge-offs, net of recoveries | (28) | (19) | (120)
Balance at December 31, | 537 | 367 | 218
Allowance for Credit Loss releases related to Discounted Payoff Losses | 58 |  |
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | 182 | 190 | 206
Provision (release) (1) | (3) | (8) | (8)
Charge-offs, net of recoveries | 0 | 0 | (8)
Balance at December 31, | 179 | 182 | 190
Agricultural Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | 172 | 119 | 88
Provision (release) (1) | 34 | 89 | 53
Charge-offs, net of recoveries | (122) | (36) | (22)
Balance at December 31, | $ 84 | $ 172 | $ 119

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