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Leases - Schedule Of Lease Expense For Finance And Operating Leases (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Finance lease expense:    
Amortization of leased assets $ 20 $ 37
Interest on lease liabilities 9 15
Operating leases [1] 99 193
Short-term lease expense [1] 75 153
Variable lease expense [1] 35 74
Total lease expense $ 238 $ 472
[1] Expenses are included in “other operating expenses” in our condensed consolidated income statements.