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Leases - Schedule of Consolidated Statement Of Operation Related To Leases (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating lease cost:    
Operating lease cost $ 48 $ 53
Variable lease costs 6 6
Finance lease cost:    
Amortization of leased assets $ 1 $ 1