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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
Dec. 31, 2016
Dec. 31, 2015
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value $ 43,641 $ 16,763
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (959) (601)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,310 1,885
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (78) (226)
Investment securities, Unrealized loss position, Total Fair Value 44,951 18,648
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (1,037) (827)
U.S. Treasury and agency    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 2,216 996
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (48) (5)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 0 153
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss 0 (1)
Investment securities, Unrealized loss position, Total Fair Value 2,216 1,149
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (48) (6)
Foreign    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 5,918 3,953
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (99) (148)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 386 436
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (27) (73)
Investment securities, Unrealized loss position, Total Fair Value 6,304 4,389
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (126) (221)
Corporate securities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 7,021 7,518
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (149) (371)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 641 738
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (44) (138)
Investment securities, Unrealized loss position, Total Fair Value 7,662 8,256
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (193) (509)
Mortgage backed-securities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 8,638 3,399
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (189) (42)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 234 516
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (5) (12)
Investment securities, Unrealized loss position, Total Fair Value 8,872 3,915
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (194) (54)
States, municipalities, and political subdivisions    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 19,448 556
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (435) (6)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 49 42
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (2) (2)
Investment securities, Unrealized loss position, Total Fair Value 19,497 598
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (437) (8)
Total fixed maturities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 43,241 16,422
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (920) (572)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,310 1,885
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (78) (226)
Investment securities, Unrealized loss position, Total Fair Value 44,551 18,307
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (998) (798)
Equity securities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 199 131
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (21) (18)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 0 0
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss 0 0
Investment securities, Unrealized loss position, Total Fair Value 199 131
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (21) (18)
Other investments    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 201 210
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (18) (11)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 0 0
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss 0 0
Investment securities, Unrealized loss position, Total Fair Value 201 210
Investment securities, Unrealized loss position, Total Gross Unrealized Loss $ (18) $ (11)