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Investments (Mortgage Loans Allowances Gross charge-offs 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] |  |  |
Charge-offs, net of recoveries | $ 150 | $ 55 | $ 150
OriginatedInCurrentFiscalYear |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Originated In Fiscal Year Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Originated Two Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Originated Three Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 16 |  |
Originated Four Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 34 |  |
Originated Five Or More Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 100 |  |
Agricultural Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 122 | 36 | 22
Agricultural Mortgage Loans | OriginatedInCurrentFiscalYear |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Agricultural Mortgage Loans | Originated In Fiscal Year Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Agricultural Mortgage Loans | Originated Two Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Agricultural Mortgage Loans | Originated Three Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 16 |  |
Agricultural Mortgage Loans | Originated Four Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 29 |  |
Agricultural Mortgage Loans | Originated Five Or More Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 77 |  |
Commercial Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 28 | 19 | 120
Commercial Mortgage Loans | OriginatedInCurrentFiscalYear |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Commercial Mortgage Loans | Originated In Fiscal Year Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Commercial Mortgage Loans | Originated Two Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Commercial Mortgage Loans | Originated Three Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 0 |  |
Commercial Mortgage Loans | Originated Four Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 5 |  |
Commercial Mortgage Loans | Originated Five Or More Years Before Latest Fiscal Year |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | 23 |  |
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-offs, net of recoveries | $ 0 | $ 0 | $ 8

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