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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 | Sep. 30, 2018 | Dec. 31, 2017
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Investment [Line Items] |  |
Fair Value, 0-12 Months |  | $ 28,685
Gross Unrealized Loss, 0-12 Months |  | (257)
Fair Value, Over 12 Months |  | 8,885
Gross Unrealized Loss, Over 12 Months |  | (227)
Total Fair Value |  | 37,570
Total Gross Unrealized Loss |  | (484)
Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | $ 50,761 | 28,492
Gross Unrealized Loss, 0-12 Months | (1,180) | (237)
Fair Value, Over 12 Months | 14,608 | 8,885
Gross Unrealized Loss, Over 12 Months | (627) | (227)
Total Fair Value | 65,369 | 37,377
Total Gross Unrealized Loss | (1,807) | (464)
Fixed Maturities [Member] | U.S. Treasury and agency |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 2,775 | 2,172
Gross Unrealized Loss, 0-12 Months | (57) | (14)
Fair Value, Over 12 Months | 1,912 | 1,249
Gross Unrealized Loss, Over 12 Months | (69) | (26)
Total Fair Value | 4,687 | 3,421
Total Gross Unrealized Loss | (126) | (40)
Fixed Maturities [Member] | Foreign |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 8,760 | 5,657
Gross Unrealized Loss, 0-12 Months | (194) | (65)
Fair Value, Over 12 Months | 3,683 | 1,693
Gross Unrealized Loss, Over 12 Months | (130) | (49)
Total Fair Value | 12,443 | 7,350
Total Gross Unrealized Loss | (324) | (114)
Fixed Maturities [Member] | Corporate securities |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 14,323 | 5,210
Gross Unrealized Loss, 0-12 Months | (335) | (56)
Fair Value, Over 12 Months | 2,272 | 1,332
Gross Unrealized Loss, Over 12 Months | (114) | (46)
Total Fair Value | 16,595 | 6,542
Total Gross Unrealized Loss | (449) | (102)
Fixed Maturities [Member] | Mortgage-backed securities |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 12,575 | 6,194
Gross Unrealized Loss, 0-12 Months | (371) | (31)
Fair Value, Over 12 Months | 4,029 | 3,209
Gross Unrealized Loss, Over 12 Months | (227) | (74)
Total Fair Value | 16,604 | 9,403
Total Gross Unrealized Loss | (598) | (105)
Fixed Maturities [Member] | States, municipalities, and political subdivisions |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 12,328 | 9,259
Gross Unrealized Loss, 0-12 Months | (223) | (71)
Fair Value, Over 12 Months | 2,712 | 1,402
Gross Unrealized Loss, Over 12 Months | (87) | (32)
Total Fair Value | 15,040 | 10,661
Total Gross Unrealized Loss | $ (310) | (103)
Equity Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months |  | 115
Gross Unrealized Loss, 0-12 Months |  | (12)
Fair Value, Over 12 Months |  | 0
Gross Unrealized Loss, Over 12 Months |  | 0
Total Fair Value |  | 115
Total Gross Unrealized Loss |  | (12)
Other Long-term Investments [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months |  | 78
Gross Unrealized Loss, 0-12 Months |  | (8)
Fair Value, Over 12 Months |  | 0
Gross Unrealized Loss, Over 12 Months |  | 0
Total Fair Value |  | 78
Total Gross Unrealized Loss |  | $ (8)

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