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Fair Value Measurements (Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Comprehensive Income (Loss), before Tax |  | Other Comprehensive Income (Loss), before Tax |  | Other Comprehensive Income (Loss), before Tax |
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues |  | Revenues |  | Revenues |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues |  | Revenues |  | Revenues |
Minimum |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate |  | 3.00% |  |  |  |  |
Annuitization rate |  | 0.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate |  | 30.00% |  |  |  |  |
Annuitization rate |  | 100.00% |  |  |  |  |
Weighted Average |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate | [1] | 3.60% |  |  |  |  |
Annuitization rate | [1] | 4.40% |  |  |  |  |
Level 3 | Guaranteed Minimum Income Benefit |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues | [2] | Revenues | [3] | Revenues | [4]
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Revenues | [2] | Revenues | [3] | Revenues | [4]
Level 3 | Fair Value, Recurring [Member] | Guaranteed Minimum Income Benefit |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross |  | $ 736 | [1],[5] | $ 745 | [6] |  |
[1] | The weighted average lapse and annuitization rates are determined by weighting each treaty's rates by the GLB contracts fair value.
[2] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[3] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[4] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[5] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[6] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.

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