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Leases - Operating Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Operating Lease Expense        
Long-term fixed lease $ 63 $ 65 $ 126 $ 128
Long-term variable lease 13 8 22 16
Short-term lease 114 110 224 210
Total operating lease expense $ 190 $ 183 $ 372 $ 354