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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, 2017
Dec. 31, 2016
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value $ 28,685 $ 43,641
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (257) (959)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 8,885 1,310
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (227) (78)
Investment securities, Unrealized loss position, Total Fair Value 37,570 44,951
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (484) (1,037)
U.S. Treasury and agency    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 2,172 2,216
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (14) (48)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,249 0
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (26) 0
Investment securities, Unrealized loss position, Total Fair Value 3,421 2,216
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (40) (48)
Foreign    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 5,657 5,918
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (65) (99)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,693 386
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (49) (27)
Investment securities, Unrealized loss position, Total Fair Value 7,350 6,304
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (114) (126)
Corporate securities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 5,210 7,021
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (56) (149)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,332 641
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (46) (44)
Investment securities, Unrealized loss position, Total Fair Value 6,542 7,662
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (102) (193)
Mortgage backed-securities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 6,194 8,638
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (31) (189)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 3,209 234
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (74) (5)
Investment securities, Unrealized loss position, Total Fair Value 9,403 8,872
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (105) (194)
States, municipalities, and political subdivisions    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 9,259 19,448
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (71) (435)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 1,402 49
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (32) (2)
Investment securities, Unrealized loss position, Total Fair Value 10,661 19,497
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (103) (437)
Total fixed maturities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 28,492 43,241
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (237) (920)
Investment securities, Unrealized loss position, Over 12 Months, Fair Value 8,885 1,310
Investment securities, Unrealized loss position, Over 12 Months, Gross Unrealized Loss (227) (78)
Investment securities, Unrealized loss position, Total Fair Value 37,377 44,551
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (464) (998)
Equity securities    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 115 199
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (12) (21)
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 115 199
Investment securities, Unrealized loss position, Total Gross Unrealized Loss (12) (21)
Other investments    
Investment [Line Items]    
Investment securities, Unrealized loss position, 0-12 Months, Fair Value 78 201
Investment securities, Unrealized loss position, 0-12 Months, Gross Unrealized Loss (8) (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 78 201
Investment securities, Unrealized loss position, Total Gross Unrealized Loss $ (8) $ (18)