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Fair Value Measurements (Assets Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Transfers Into Level 3, Asset     $ 0 $ 0        
Level 3 | Non-U.S.                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Balance- Beginning of Period, Assets $ 465 $ 360 449 345        
Transfers Into Level 3, Asset   0 0 3        
Transfers out of Level 3, Assets (13)   (16) (15)        
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) (6) 0 (20) 6        
Net Realized Gains/ (Losses), Assets (1) 0 (3) (1)        
Purchases, Assets 67 43 149 96        
Sales, Assets (16) (14) (62) (19)        
Settlements, Assets (27) (18) (28) (44)        
Balance-End of Period, Assets 469 371 469 371        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Level 3 | Corporate and asset-backed securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Balance- Beginning of Period, Assets 1,502 1,342 1,451 1,299        
Transfers Into Level 3, Asset   10 91 15        
Transfers out of Level 3, Assets (71)   (72) 0        
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) 1 1 (44) 5        
Net Realized Gains/ (Losses), Assets (13) (1) (26) 0        
Purchases, Assets 83 121 222 249        
Sales, Assets (48) (36) (67) (73)        
Settlements, Assets (85) (78) (186) (136)        
Balance-End of Period, Assets 1,369 1,359 1,369 1,359        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 5 (1) (9) (1)        
Level 3 | Mortgage-backed securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Balance- Beginning of Period, Assets 60 78 60 61        
Transfers Into Level 3, Asset   0            
Transfers out of Level 3, Assets 0   0 0        
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Net Realized Gains/ (Losses), Assets 0 0 0 0        
Purchases, Assets 0 0 0 18        
Sales, Assets 0 (1) 0 (1)        
Settlements, Assets 0 (1) 0 (2)        
Balance-End of Period, Assets 60 76 60 76        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Level 3 | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0   0          
Balance- Beginning of Period, Assets 67 55 69 57        
Transfers Into Level 3, Asset   0            
Transfers out of Level 3, Assets 0   0 0        
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) (1) 1 0 2        
Net Realized Gains/ (Losses), Assets (1) (1) (3) (3)        
Purchases, Assets 8 5 11 14        
Sales, Assets (9) (4) (13) (14)        
Settlements, Assets 0 0 0 0        
Balance-End of Period, Assets 64 56 64 56        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 1 (1) (1) (2)        
Level 3 | Short-term Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0   0          
Balance- Beginning of Period, Assets 1 0 6 1        
Transfers Into Level 3, Asset   0            
Transfers out of Level 3, Assets 0   0 0        
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Net Realized Gains/ (Losses), Assets 0 0 0 0        
Purchases, Assets 1 4 2 4        
Sales, Assets 0 0 0 0        
Settlements, Assets 0 0 (6) (1)        
Balance-End of Period, Assets 2 4 2 4        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Level 3 | Other Long-term Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0   0          
Balance- Beginning of Period, Assets 10 11 10 11        
Transfers Into Level 3, Asset   0            
Transfers out of Level 3, Assets 0   0 0        
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Net Realized Gains/ (Losses), Assets 0 0 0 0        
Purchases, Assets 0 0 0 0        
Sales, Assets 0 0 0 0        
Settlements, Assets 0 0 0 0        
Balance-End of Period, Assets 10 11 10 11        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) 0 0 0 0        
Available-for-sale Securities [Member] | Level 3 | Non-U.S.                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI (5)   (20)          
Available-for-sale Securities [Member] | Level 3 | Corporate and asset-backed securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 7   (37)          
Available-for-sale Securities [Member] | Level 3 | Mortgage-backed securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0   0          
Guaranteed Minimum Income Benefit [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 928 403 928 403 $ 1,141 $ 456 $ 338 $ 452
Guaranteed Minimum Income Benefit [Member] | Level 3                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0   0          
Guaranteed Minimum Income Benefit [Member] | Fair Value, Recurring [Member] | Level 3                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value [1] 928   928     456 [2]    
Guaranteed Minimum Income Benefit [Member] | Guarantees [Member] | Level 3                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 928 [3],[4] 403 [4] 928 [3],[4] 403 [4] $ 1,141 [3] $ 456 $ 338 [4] $ 452 [4]
Transfers into level 3, liability   0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (213) [3] 65 [4] 472 (49) [4]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0 0 0 0        
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) (213) [3] $ 65 [4] 472 (49) [4]        
Transfers out of Level 3, Liabilities $ 0   $ 0 $ 0        
[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. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.
[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 $1,372 million at June 30, 2020, and $1,591 million at March 31, 2020, which includes a fair value derivative adjustment of $928 million and $1,141 million, respectivel
[4] 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 $815 million at June 30, 2019, and $741 million at March 31, 2019, which includes a fair value derivative adjustment of $403 million and $338 million, respectively