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Share Repurchases Transactions and Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Equity [Abstract]  
Unrealized losses on available-for-sale securities, tax benefit portion $ 3
Foreign currency translation adjustments, income tax benefit 1
Change in fair value of derivative instruments, income tax expense (benefit) 12
Defined benefit plans, Expense reclassified into operations from other comprehensive income, Income tax benefits 2
Change in fair value of derivative instruments, Expense reclassified into operations from other comprehensive income, Income tax benefits $ 2