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Leasing - Schedule of Lease Expense and Operating Cash Flows (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Costs from operating leases $ 17 $ 20 $ 38 $ 38
Variable lease payments 4 $ 1 5 5
Short-term rental expense $ 1   $ 1 $ 1