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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 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment [Line Items] |  |
Fair Value, 0-12 Months | $ 38,278 | $ 43,641
Gross Unrealized Loss, 0-12 Months | (678) | (959)
Fair Value, Over 12 Months | 1,429 | 1,310
Gross Unrealized Loss, Over 12 Months | (60) | (78)
Total Fair Value | 39,707 | 44,951
Total Gross Unrealized Loss | (738) | (1,037)
U.S. Treasury And Agency [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 2,011 | 2,216
Gross Unrealized Loss, 0-12 Months | (38) | (48)
Fair Value, Over 12 Months | 0 | 0
Gross Unrealized Loss, Over 12 Months | 0 | 0
Total Fair Value | 2,011 | 2,216
Total Gross Unrealized Loss | (38) | (48)
Foreign [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 4,428 | 5,918
Gross Unrealized Loss, 0-12 Months | (59) | (99)
Fair Value, Over 12 Months | 684 | 386
Gross Unrealized Loss, Over 12 Months | (21) | (27)
Total Fair Value | 5,112 | 6,304
Total Gross Unrealized Loss | (80) | (126)
Corporate [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 6,139 | 7,021
Gross Unrealized Loss, 0-12 Months | (121) | (149)
Fair Value, Over 12 Months | 491 | 641
Gross Unrealized Loss, Over 12 Months | (32) | (44)
Total Fair Value | 6,630 | 7,662
Total Gross Unrealized Loss | (153) | (193)
Collateralized Mortgage Backed Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 8,735 | 8,638
Gross Unrealized Loss, 0-12 Months | (195) | (189)
Fair Value, Over 12 Months | 131 | 234
Gross Unrealized Loss, Over 12 Months | (3) | (5)
Total Fair Value | 8,866 | 8,872
Total Gross Unrealized Loss | (198) | (194)
States, Municipalities, And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 16,731 | 19,448
Gross Unrealized Loss, 0-12 Months | (248) | (435)
Fair Value, Over 12 Months | 123 | 49
Gross Unrealized Loss, Over 12 Months | (4) | (2)
Total Fair Value | 16,854 | 19,497
Total Gross Unrealized Loss | (252) | (437)
Fixed Maturities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 38,044 | 43,241
Gross Unrealized Loss, 0-12 Months | (661) | (920)
Fair Value, Over 12 Months | 1,429 | 1,310
Gross Unrealized Loss, Over 12 Months | (60) | (78)
Total Fair Value | 39,473 | 44,551
Total Gross Unrealized Loss | (721) | (998)
Equity Securities [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 150 | 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 | 150 | 199
Total Gross Unrealized Loss | (8) | (21)
Other Long-term Investments [Member] |  |
Investment [Line Items] |  |
Fair Value, 0-12 Months | 84 | 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 | 84 | 201
Total Gross Unrealized Loss | $ (9) | $ (18)

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