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Share Repurchases Transactions and Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Equity [Abstract]
Unrealized losses on available-for-sale securities, tax benefit portion	$ 2
Foreign currency translation adjustments, income tax benefit	3
Change in fair value of derivative instruments, income tax expense (benefit)	4
Defined benefit plans, Expense reclassified into operations from other comprehensive income, Income tax benefits	1
Change in fair value of derivative instruments, Expense reclassified into operations from other comprehensive income, Income tax benefits	$ 1

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount of tax (expense) benefit for reclassification adjustment from accumulated other comprehensive (income) loss of defined benefit plan.

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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