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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, 2017 | Dec. 31, 2016
--- | --- | ---
Investment [Line Items] |  |
Fair Value, 0-12 Months | $ 22,243 | $ 43,641
Gross Unrealized Loss, 0-12 Months | (287) | (959)
Fair Value, Over 12 Months | 3,926 | 1,310
Gross Unrealized Loss, Over 12 Months | (120) | (78)
Total Fair Value | 26,169 | 44,951
Total Gross Unrealized Loss | (407) | (1,037)
U.S. Treasury And Agency [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 1,763 | 2,216
Gross Unrealized Loss, 0-12 Months | (13) | (48)
Fair Value, Over 12 Months | 656 | 0
Gross Unrealized Loss, Over 12 Months | (17) | 0
Total Fair Value | 2,419 | 2,216
Total Gross Unrealized Loss | (30) | (48)
Foreign [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 5,353 | 5,918
Gross Unrealized Loss, 0-12 Months | (85) | (99)
Fair Value, Over 12 Months | 894 | 386
Gross Unrealized Loss, Over 12 Months | (22) | (27)
Total Fair Value | 6,247 | 6,304
Total Gross Unrealized Loss | (107) | (126)
Corporate [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 3,373 | 7,021
Gross Unrealized Loss, 0-12 Months | (48) | (149)
Fair Value, Over 12 Months | 788 | 641
Gross Unrealized Loss, Over 12 Months | (40) | (44)
Total Fair Value | 4,161 | 7,662
Total Gross Unrealized Loss | (88) | (193)
Collateralized Mortgage Backed Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 6,946 | 8,638
Gross Unrealized Loss, 0-12 Months | (96) | (189)
Fair Value, Over 12 Months | 749 | 234
Gross Unrealized Loss, Over 12 Months | (19) | (5)
Total Fair Value | 7,695 | 8,872
Total Gross Unrealized Loss | (115) | (194)
States, Municipalities, And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 4,548 | 19,448
Gross Unrealized Loss, 0-12 Months | (28) | (435)
Fair Value, Over 12 Months | 839 | 49
Gross Unrealized Loss, Over 12 Months | (22) | (2)
Total Fair Value | 5,387 | 19,497
Total Gross Unrealized Loss | (50) | (437)
Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 21,983 | 43,241
Gross Unrealized Loss, 0-12 Months | (270) | (920)
Fair Value, Over 12 Months | 3,926 | 1,310
Gross Unrealized Loss, Over 12 Months | (120) | (78)
Total Fair Value | 25,909 | 44,551
Total Gross Unrealized Loss | (390) | (998)
Equity Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 103 | 199
Gross Unrealized Loss, 0-12 Months | (8) | (21)
Fair Value, Over 12 Months | 0 | 0
Gross Unrealized Loss, Over 12 Months | 0 | 0
Total Fair Value | 103 | 199
Total Gross Unrealized Loss | (8) | (21)
Other Long-term Investments [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 157 | 201
Gross Unrealized Loss, 0-12 Months | (9) | (18)
Fair Value, Over 12 Months | 0 | 0
Gross Unrealized Loss, Over 12 Months | 0 | 0
Total Fair Value | 157 | 201
Total Gross Unrealized Loss | $ (9) | $ (18)

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