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Leases - Schedule of Consolidated Statement Of Operation Related To Leases (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating lease cost:        
Operating lease cost $ 44 $ 54 $ 92 $ 107
Variable lease costs 5 7 11 13
Finance lease cost:        
Amortization of leased assets $ 1 $ 1 $ 2 $ 2