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Amounts Recognized in Other Comprehensive Income (Loss) Related to Postretirement Benefit Plans, Net of Tax (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts |  | $ (239) | $ (259) | $ (100)
Recognition of net prior service credits from divestiture of IS&GS segment | [1] | 134 |  |
Discontinued Operations | Information Systems & Global Solutions |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net prior service (credit) and cost - Recognition of Previously Deferred Amounts |  | 9 | $ 16 | $ 11
Recognition of net prior service credits from divestiture of IS&GS segment |  | $ 134 |  |
[1] | Associated with the divesture of the IS&GS business and included in net gain on divestiture of discontinued operations.

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