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Leases - Components of Lease Expense (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Finance lease cost  
Finance lease cost, amortization of right-of-use assets $ 8
Finance lease cost, interest on lease liabilities 4
Operating lease cost 33
Short-term lease cost 16
Sub-lease income 3
Total $ 58