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Claim and Claim Adjustment Expense Reserves - Impact of Loss Portfolio Transfer on Consolidated Condensed Statements of Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Insurance [Abstract] |  |  |  |  |
Net A&EP adverse development before consideration of LPT |  | $ 200 |  | $ 200 | $ 150
Provision for uncollectible third party reinsurance on A&EP | $ 0 |  | $ 0 | 0 | 0
Additional amounts ceded under LPT |  |  |  | 200 | 150
Retroactive reinsurance benefit recognized | (12) |  | (4) | (94) | (75)
Pretax impact of unrecognized deferred retroactive reinsurance benefit | $ (12) |  | $ (4) | $ 106 | $ 75

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- Definition Additional Amounts Ceded Under Loss Portfolio Transfer + References No definition available. + Details
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- Definition Benefit Recognized Under Retroactive Reinsurance Accounting + References No definition available. + Details
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- Definition Net Asbestos And Environmental Pollution Adverse Development Before Consideration Of Loss Portfolio Transfer + References No definition available. + Details
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- Definition Pretax impact of unrecognized deferred retroactive insurance benefit. + References No definition available. + Details
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- Definition Provision for uncollectible third party reinsurance on asbestos and environmental pollution. + References No definition available. + Details
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- References No definition available. + Details
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