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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other investment related gains (losses), net |  |  |  |  |  |  |  |  |  | $ 24 | $ 26 | $ 25
Net investment income |  |  |  |  |  |  |  |  |  | 3,591 | 3,161 | 3,138
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  |  |  |  |  |  |  |  |  | 1 | 3 | (2)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  |  |  |  |  |  |  |  |  | 3 | (33) | (27)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  | $ 164 | $ 380 | $ 265 | $ 351 | $ 381 | $ (77) | $ 147 | $ 267 | 1,160 | 718 | 1,385
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | (251) | (197) | (215)
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | 902 | 517 | $ 1,170
Amortization Of Unrealized Pension And Postretirement Benefits [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | [1] |  |  |  |  |  |  |  |  | 2 | (2) |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | [1] |  |  |  |  |  |  |  |  | (2) | (4) |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 0 | (2) |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 0 | 0 |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | 0 | (2) |
Unrealized Appreciation Depreciation Of Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other investment related gains (losses), net |  |  |  |  |  |  |  |  |  | (228) | (218) |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  |  |  |  |  |  |  | (241) | (227) |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 52 | 42 |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | (189) | (185) |
Amounts Reclassified From AOCI [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | (189) | (187) |
Interest Rate Options [Member] | Unrealized Gains Losses On Available For Sale Securities [Member] | Unrealized Appreciation Depreciation Of Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [2] |  |  |  |  |  |  |  |  | 10 | (1) |
Currency Swap [Member] | Unrealized Gains Losses On Available For Sale Securities [Member] | Unrealized Appreciation Depreciation Of Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [2] |  |  |  |  |  |  |  |  | $ (23) | $ (8) |
[1] | See Note 15 for information on employee benefit plans.
[2] | See Note 12 for information on cash flow hedges.

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