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Fair Value Measurements (Assets and Liabilities, Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - Level 3 - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets $ 75 $ 67 $ 73 $ 69
Transfers Into Level 3, Asset 0   0 0
Transfers out of Level 3, Assets 0 0 0 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets 0 (1) 0 0
Net Realized Gains/ (Losses), Assets 5 (1) 7 (3)
Purchases, Assets 4 8 7 11
Sales, Assets (6) (9) (9) (13)
Settlements, Assets 0 0 0 0
Other, Assets 0 0 0 0
Balance-End of Period, Assets 78 64 78 64
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 4 1 6 (1)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets 0 0 0 0
Short-term Investments [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets 1 1 5 6
Transfers Into Level 3, Asset 0   0 0
Transfers out of Level 3, Assets 0 0 0 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets 0 0 0 0
Net Realized Gains/ (Losses), Assets 0 0 0 0
Purchases, Assets 2 1 3 2
Sales, Assets 0 0 0 0
Settlements, Assets 0 0 (5) (6)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 3 2 3 2
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 0 0 0 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets 0 0 0 0
Other Investments [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets 10 10 10 10
Transfers Into Level 3, Asset 0   0 0
Transfers out of Level 3, Assets 0 0 0 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets 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
Other, Assets 0 0 0 0
Balance-End of Period, Assets 10 10 10 10
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 0 0 0 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets 0 0 0 0
Available-for-sale Securities [Member] | Non-U.S.        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets 650 465 546 449
Transfers Into Level 3, Asset 0   0 0
Transfers out of Level 3, Assets (10) (13) (10) (16)
Change in Net Unrealized Gains (Losses) included in OCI, Assets 5 (6) 13 (20)
Net Realized Gains/ (Losses), Assets 3 (1) 3 (3)
Purchases, Assets 54 67 175 149
Sales, Assets (9) (16) (16) (62)
Settlements, Assets (51) (27) (69) (28)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 642 469 642 469
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 0 0 0 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets 7 (5) 17 (20)
Available-for-sale Securities [Member] | Corporate and asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets 1,612 1,502 1,573 1,451
Transfers Into Level 3, Asset 29   46 91
Transfers out of Level 3, Assets (3) (71) (3) (72)
Change in Net Unrealized Gains (Losses) included in OCI, Assets 6 (1) 12 (44)
Net Realized Gains/ (Losses), Assets 6 (13) 3 (26)
Purchases, Assets 240 83 409 222
Sales, Assets (50) (48) (75) (67)
Settlements, Assets (152) (85) (277) (186)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 1,688 1,369 1,688 1,369
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 6 5 3 (9)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets 6 7 17 (37)
Available-for-sale Securities [Member] | Mortgage-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets 51 60 60 60
Transfers Into Level 3, Asset 0   0 0
Transfers out of Level 3, Assets 0 0 0 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets 0 0 0 0
Net Realized Gains/ (Losses), Assets 0 0 0 0
Purchases, Assets 1 0 1 0
Sales, Assets (1) 0 (1) 0
Settlements, Assets (4) 0 (13) 0
Other, Assets 0 0 0 0
Balance-End of Period, Assets 47 60 47 60
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 0 0 0 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets 0 0 0 0
Guaranteed Minimum Income Benefit [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance - Beginning of Period, Liabilities 760 [1] 1,591 [2] 1,089 897
Transfers into level 3, liability 0   0 0
Transfers out of Level 3, Liabilities 0 0 0 0
Change in Net Unrealized Gains (losses) included in OCI, Liabilities 0 0 0 0
Net Realized Gains/(Losses), Liabilities 8 [1] (213) [2] (311) 472
Purchases, Liabilities 0 0 0 0
Sales, Liabilities 0 0 0 0
Settlements, Liabilities 0 0 0 0
Other, Liabilities (8) (6) (18) 3
Balance - End of Period, Liabilities 760 [1] 1,372 [2] 760 [1] 1,372 [2]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities 8 [1] (213) [2] (311) 472
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Liabilities $ 0 $ 0 $ 0 $ 0
[1] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[2] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.