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Leases - Components of Lease Cost and Rent Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease cost $ 49 $ 50 $ 147 $ 152
Short-term rent expense 22 27 70 80
Variable lease cost 5 9 17 20
Sublease income (1) (1) (3) (4)
Total operating lease cost 75 85 231 248
Finance lease cost:        
Amortization of right-of-use assets 2 2 6 8
Interest on finance lease liabilities 2 2 5 6
Total finance lease cost $ 4 $ 4 $ 11 $ 14