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Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  | $ (91) | $ 2 | $ (247) | $ (109) |  |
Net income |  | 287 | (76) | 744 | 226 | $ 517 | $ 1,170
Unrealized Appreciation Depreciation Of Investments [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Investment related gains (losses), net |  | (36) | (92) | (132) | (195) |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  | (41) | (95) | (140) | (202) |  |
Income Tax Expense (Benefit) |  | 13 | 20 | 36 | 42 |  |
Net income |  | (28) | (75) | (104) | (160) |  |
Amortization Of Unrealized Pension And Postretirement Benefits [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Prior service cost | [1] | 0 | 0 | 1 | 1 |  |
Actuarial gains/(losses) | [1] | (1) | 0 | (2) | (3) |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  | (1) | 0 | (1) | (2) |  |
Income Tax Expense (Benefit) |  | 0 | 0 | 0 | 0 |  |
Net income |  | (1) | 0 | (1) | (2) |  |
Amounts Reclassified From AOCI [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Net income |  | (29) | (75) | (105) | (162) |  |
Currency Swap [Member] | Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [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] | (8) | (3) | (15) | (5) |  |
Interest Rate Options [Member] | Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [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] | $ 3 | $ 0 | $ 7 | $ (2) |  |
[1] | This AOCI component is included in the computation of the net periodic pension cost. See Note 15 – “Employee Benefit Plans” for additional details.
[2] | See Note 12 – “Derivative Instruments” for additional information on cash flow hedges.

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