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Accumulated Other Comprehensive Income (Loss) - Impact and Location of AOCI Reclassifications in Consolidated Statements of Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Expense |  |  |  |  |  |  |  |  | $ (8) | $ (6) | $ (8)
Income tax benefit |  |  |  |  |  |  |  |  | 3 | (125) | (96)
Net income (loss) | $ 15 | $ 18 | $ 4 | $ (7) | $ (74) | $ 13 | $ (4) | $ (2) | 30 | (67) | 125
Amount Reclassified from of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Expense |  |  |  |  |  |  |  |  | (6) | (5) | (4)
Income tax benefit |  |  |  |  |  |  |  |  | 1 | 1 | 1
Net income (loss) |  |  |  |  |  |  |  |  | $ (5) | $ (4) | $ (3)

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