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Leases (Tables)
6 Months Ended
Jun. 30, 2023
Leases [Abstract]  
Schedule of Lease Expense
The components of lease expense consist of the following (in millions):
Three Months Ended June 30,Six Months Ended June 30,
Classification2023202220232022
Operating lease cost(a)
Direct operating$34 $35 $67 $66 
Finance lease cost:
Amortization of ROU assetsDepreciation and amortization11 10 
Interest on lease liabilitiesInterest expense, net
Sublease incomeEquipment rental revenue(16)(21)(32)(39)
Net lease cost$24 $20 $47 $38 

(a) Includes short-term leases of $14 million and $28 million for the three and six months ended June 30, 2023, respectively, and $18 million and $33 million for the three and six months ended June 30, 2022, respectively, and variable lease costs of $1 million and $2 million for the three and six months ended June 30, 2023, respectively, and none and $1 million for the three and six months ended June 30, 2022, respectively.