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Income Taxes - Liability Related to Uncertain Tax Positions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |
Balance at January 1 | $ 28 | $ 30
Gross decreases for prior period tax positions | 0 | (1)
Gross increases for prior period tax positions | 3 | 0
Gross increases for current period tax positions | 8 | 3
Decreases due to the lapse of applicable statute of limitations | (1) | (4)
Decreases relating to settlements with taxing authorities | 4 | 0
Balance at December 31 | $ 34 | $ 28

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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