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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 |  | 31.00% |  |  |  |
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 |  | 4.50% |  |  |  |
Annuitization rate | [1] | 3.60% |  |  |  |
Level 3 | Equity Securities [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Settlements, assets |  | $ 0 |  | $ 0 | $ 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) |  | 0 |  | 0 | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets |  | 0 |  | 0 | 0 |
Level 3 | Short-term investments |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Settlements, assets |  | (6) |  | (12) | (1) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) |  | 0 |  | 0 | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets |  | 0 |  | 0 | 0 |
Level 3 | Other Long-term Investments [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Settlements, assets |  | 0 |  | 0 | (1) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) |  | 0 |  | 0 | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets |  | 0 |  | 0 | 0 |
Level 3 | Fixed maturities available for sale | Debt Security, Government, Non-US [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Settlements, assets |  | (122) |  | (57) | (53) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) |  | 0 |  | 0 | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets |  | (25) |  | 16 | 7 |
Level 3 | Fixed maturities available for sale | Corporate securities |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Settlements, assets |  | (607) |  | (423) | (279) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) |  | 0 |  | 0 | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets |  | 17 |  | (6) | (8) |
Level 3 | Fixed maturities available for sale | Mortgage-backed securities |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Settlements, assets |  | (33) |  | (1) | (3) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) |  | 0 |  | 0 | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets |  | 0 |  | 0 | 0 |
Guaranteed Minimum Income Benefit | Level 3 |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value |  | 745 | [2] | 1,089 | 897 | $ 861
Settlements, liabilities |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) |  | (28) |  | (10) | 32 |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | 0 |  | $ 0 | $ 0 |
Guaranteed Minimum Income Benefit | Level 3 | Fair Value, Recurring [Member] |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value |  | $ 745 |  |  |  |
[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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