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Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Investment [Line Items]    
Document Period End Date Dec. 31, 2020  
Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 4,755 $ 5,563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (75) (81)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 758 3,337
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (22) (88)
Debt Securities, Available-for-sale, Unrealized Loss Position 5,513 8,900
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (97) (169)
U.S. Treasury and agency | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months   234
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   339
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Debt Securities, Available-for-sale, Unrealized Loss Position   573
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss   (1)
Foreign | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,628 1,846
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (35) (34)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 114 802
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (5) (28)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,742 2,648
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (40) (62)
Corporate securities | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 2,212 2,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (33) (40)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 593 988
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (14) (40)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,805 3,109
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (47) (80)
Mortgage-backed securities | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 875 1,174
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (6) (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 35 932
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2) (8)
Debt Securities, Available-for-sale, Unrealized Loss Position 910 2,106
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (8) (14)
States, municipalities, and political subdivisions | Fixed Maturities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 40 188
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1) 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 16 276
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1) (12)
Debt Securities, Available-for-sale, Unrealized Loss Position 56 464
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (2) $ (12)