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Fair Value Measurements (Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations) (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | [2]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair Value Measurements, Valuation Processes, Description |  | Actuarial model |
Weighted Average [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate | [1] | 4.70% |
Significant Unobservable Inputs Annuitization Rate | [1] | 3.30% |
Minimum [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate |  | 3.00% |
Significant Unobservable Inputs Annuitization Rate |  | 0.00% |
Maximum [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate |  | 34.00% |
Significant Unobservable Inputs Annuitization Rate |  | 100.00% |
Level 3 | Fair Value, Recurring [Member] | GLB |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross |  | $ 760 | $ 1,089
[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.

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