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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
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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)

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