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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, 2018
Mar. 31, 2018
[2]
Dec. 31, 2017
Jun. 30, 2017
[3]
Mar. 31, 2017
[3]
Dec. 31, 2016
[3]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Fair Value Measurements, Valuation Techniques [1] Actuarial model          
Minimum [Member]            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate [1] 3.00%          
Significant Unobservable Inputs Annuitization Rate [1] 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 [1] 33.00%          
Significant Unobservable Inputs Annuitization Rate [1] 100.00%          
Guaranteed Minimum Income Benefit [Member]            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 125 [2] $ 167 $ 204 [2] $ 357 $ 466 $ 559
Guaranteed Minimum Income Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value [4] $ 125   $ 204      
[1] Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 3 a) Guaranteed living benefits.
[2] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $497 million at June 30, 2018, and $529 million at March 31, 2018, which includes a fair value derivative adjustment of $125 million and $167 million, respectively.
[3] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $684 million at June 30, 2017, and $774 million at March 31, 2017, which includes a fair value derivative adjustment of $357 million and $466 million, respectively.
[4] (2) Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.