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Leases - Operating Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Operating Lease Expense        
Long-term fixed lease $ 65 $ 64 $ 190 $ 192
Long-term variable lease 14 7 36 24
Short-term lease 127 119 351 328
Total operating lease expense $ 206 $ 190 $ 577 $ 544