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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, 2015
Dec. 31, 2014
Investment [Line Items]    
Document Period End Date Dec. 31, 2015  
Investment securities, Unrealized loss position, 0-12 Months, Fair Value $ 16,763 $ 8,559
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (601) (244)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,885 3,932
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (226) (79)
Investment securities, Unrealized loss position, Total Fair Value 18,648 12,491
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (827) (323)
U.S. Treasury and agency    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 996 350
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (5) (1)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 153 666
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (1) (9)
Investment securities, Unrealized loss position, Total Fair Value 1,149 1,016
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (6) (10)
Foreign    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 3,953 2,262
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (148) (75)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 436 375
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (73) (15)
Investment securities, Unrealized loss position, Total Fair Value 4,389 2,637
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (221) (90)
Corporate securities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 7,518 4,684
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (371) (150)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 738 738
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (138) (22)
Investment securities, Unrealized loss position, Total Fair Value 8,256 5,422
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (509) (172)
Mortgage backed-securities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 3,399 704
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (42) (2)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 516 1,663
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (12) (28)
Investment securities, Unrealized loss position, Total Fair Value 3,915 2,367
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (54) (30)
States, municipalities, and political subdivisions    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 556 458
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (6) (3)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 42 490
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (2) (5)
Investment securities, Unrealized loss position, Total Fair Value 598 948
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (8) (8)
Total fixed maturities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 16,422 8,458
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (572) (231)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,885 3,932
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (226) (79)
Investment securities, Unrealized loss position, Total Fair Value 18,307 12,390
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (798) (310)
Equity securities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 131 101
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (18) (13)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 0  
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss 0 0
Investment securities, Unrealized loss position, Total Fair Value 131 101
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (18) $ (13)
Other investments    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 210  
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (11)  
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 0  
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss 0  
Investment securities, Unrealized loss position, Total Fair Value 210  
Investment securities, Unrealized loss position, Total Gross Unrealized Loss $ (11)