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Leases - Schedule Of Lease Expense For Finance And Operating Leases (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Finance lease expense:    
Amortization of leased assets $ 33 $ 70
Interest on lease liabilities 9 24
Operating leases [1] 94 287
Short-term lease expense [1] 82 235
Variable lease expense [1] 40 114
Total lease expense $ 258 $ 730
[1] Expenses are included in “other operating expenses” in our condensed consolidated income statements.