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Leases - Operating Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Operating Lease Expense        
Long-term fixed lease $ 71 $ 61 $ 213 $ 169
Long-term variable lease 3 13 23 37
Short-term lease 102 202 382 544
Total operating lease expense $ 176 $ 276 $ 618 $ 750