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Fair Value Measurements (Narrative) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, Gain (Loss) on Derivative, Net $ (228) $ (585) $ (330)  
Accounts payable, accrued expenses, and other liabilities 14,052 12,214    
Guaranteed Minimum Income Benefit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, Gain (Loss) on Derivative, Net (202) (4) (248)  
Accounts payable, accrued expenses, and other liabilities   441 409 $ 346
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Short-term investments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Other Long-term Investments [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed maturities available for sale | Debt Security, Government, Non-US [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed maturities available for sale | Corporate securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed maturities available for sale | Mortgage-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) 0 0 0  
Guaranteed Minimum Income Benefit | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) $ (10) $ 32 $ 63