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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 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment [Line Items] |  |
Fair Value, 0-12 Months | $ 27,692 | $ 43,641
Gross Unrealized Loss, 0-12 Months | (375) | (959)
Fair Value, Over 12 Months | 1,271 | 1,310
Gross Unrealized Loss, Over 12 Months | (63) | (78)
Total Fair Value | 28,963 | 44,951
Total Gross Unrealized Loss | (438) | (1,037)
U.S. Treasury And Agency [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 2,021 | 2,216
Gross Unrealized Loss, 0-12 Months | (28) | (48)
Fair Value, Over 12 Months | 0 | 0
Gross Unrealized Loss, Over 12 Months | 0 | 0
Total Fair Value | 2,021 | 2,216
Total Gross Unrealized Loss | (28) | (48)
Foreign [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 4,381 | 5,918
Gross Unrealized Loss, 0-12 Months | (57) | (99)
Fair Value, Over 12 Months | 599 | 386
Gross Unrealized Loss, Over 12 Months | (25) | (27)
Total Fair Value | 4,980 | 6,304
Total Gross Unrealized Loss | (82) | (126)
Corporate [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 4,410 | 7,021
Gross Unrealized Loss, 0-12 Months | (72) | (149)
Fair Value, Over 12 Months | 372 | 641
Gross Unrealized Loss, Over 12 Months | (29) | (44)
Total Fair Value | 4,782 | 7,662
Total Gross Unrealized Loss | (101) | (193)
Collateralized Mortgage Backed Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 7,657 | 8,638
Gross Unrealized Loss, 0-12 Months | (141) | (189)
Fair Value, Over 12 Months | 118 | 234
Gross Unrealized Loss, Over 12 Months | (4) | (5)
Total Fair Value | 7,775 | 8,872
Total Gross Unrealized Loss | (145) | (194)
States, Municipalities, And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 9,049 | 19,448
Gross Unrealized Loss, 0-12 Months | (68) | (435)
Fair Value, Over 12 Months | 182 | 49
Gross Unrealized Loss, Over 12 Months | (5) | (2)
Total Fair Value | 9,231 | 19,497
Total Gross Unrealized Loss | (73) | (437)
Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 27,518 | 43,241
Gross Unrealized Loss, 0-12 Months | (366) | (920)
Fair Value, Over 12 Months | 1,271 | 1,310
Gross Unrealized Loss, Over 12 Months | (63) | (78)
Total Fair Value | 28,789 | 44,551
Total Gross Unrealized Loss | (429) | (998)
Equity Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 104 | 199
Gross Unrealized Loss, 0-12 Months | (5) | (21)
Fair Value, Over 12 Months | 0 | 0
Gross Unrealized Loss, Over 12 Months | 0 | 0
Total Fair Value | 104 | 199
Total Gross Unrealized Loss | (5) | (21)
Other Long-term Investments [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 70 | 201
Gross Unrealized Loss, 0-12 Months | (4) | (18)
Fair Value, Over 12 Months | 0 | 0
Gross Unrealized Loss, Over 12 Months | 0 | 0
Total Fair Value | 70 | 201
Total Gross Unrealized Loss | $ (4) | $ (18)

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