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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Equity Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance- Beginning of Period, Assets $ 82 $ 75 $ 77 $ 73
Transfers Into Level 3, Asset 0 0 1 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 5 4 7
Purchases, Assets 0 4 3 7
Sales, Assets (1) (6) (4) (9)
Settlements, Assets 0 0 0 0
Other, Assets 0 0 0 0
Balance-End of Period, Assets 81 78 81 78
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets (1) 4 3 6
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 4 1 7 5
Transfers Into Level 3, Asset 0 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 5 2 7 3
Sales, Assets 0 0 0 0
Settlements, Assets 0 0 (5) (5)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 9 3 9 3
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
Transfers Into Level 3, Asset   0   0
Transfers out of Level 3, Assets   0   0
Change in Net Unrealized Gains (Losses) included in OCI, Assets   0   0
Net Realized Gains/ (Losses), Assets   0   0
Purchases, Assets   0   0
Sales, Assets   0   0
Settlements, Assets   0   0
Other, Assets   0   0
Balance-End of Period, Assets   10   10
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets   0   0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets   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 618 650 633 546
Transfers Into Level 3, Asset 5 0 23 0
Transfers out of Level 3, Assets 0 (10) (23) (10)
Change in Net Unrealized Gains (Losses) included in OCI, Assets (41) 5 (54) 13
Net Realized Gains/ (Losses), Assets 0 3 (2) 3
Purchases, Assets 26 54 69 175
Sales, Assets (19) (9) (25) (16)
Settlements, Assets (40) (51) (72) (69)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 549 642 549 642
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets 0 0 (2) 0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets (41) 7 (54) 17
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 2,229 1,612 2,049 1,573
Transfers Into Level 3, Asset 10 29 39 46
Transfers out of Level 3, Assets (43) (3) (93) (3)
Change in Net Unrealized Gains (Losses) included in OCI, Assets (30) 6 (52) 12
Net Realized Gains/ (Losses), Assets 0 6 0 3
Purchases, Assets 179 240 494 409
Sales, Assets (24) (50) (51) (75)
Settlements, Assets (60) (152) (125) (277)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 2,261 1,688 2,261 1,688
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets (1) 6 (1) 3
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets (30) 6 (52) 17
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 20 51 26 60
Transfers Into Level 3, Asset 0 0 0 0
Transfers out of Level 3, Assets 0 0 (5) 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 1 0 1
Sales, Assets 0 (1) 0 (1)
Settlements, Assets (1) (4) (2) (13)
Other, Assets 0 0 0 0
Balance-End of Period, Assets 19 47 19 47
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 696 [1] 760 [2] 745 [2] 1,089 [2]
Transfers into level 3, liability 0 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 143 [1] 8 [2] 108 [2] (311) [2]
Purchases, Liabilities 0 0 0 0
Sales, Liabilities 0 0 0 0
Settlements, Liabilities 0 0 0 0
Other, Liabilities (7) [1] (8) [2] (21) [2] (18) [2]
Balance - End of Period, Liabilities 832 [1] 760 [2] 832 [1] 760 [2]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities 143 [1] 8 [2] 108 [2] (311) [2]
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.