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Leases
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Leases Leases
Operating lease cost, which included short-term leases and variable lease payments and approximated cash paid, was $67, $84, and $87 in 2020, 2019, and 2018, respectively.
Operating lease right-of-use assets and lease liabilities in the Consolidated Balance Sheet were as follows:
December 31,20202019
Right-of-use assets classified in Other noncurrent assets$131 $125 
Current portion of lease liabilities classified in Other current liabilities
38 38 
Long-term portion of lease liabilities classified in Other noncurrent liabilities and deferred credits100 98 
Total lease liabilities$138 $136 
Future minimum contractual operating lease obligations were as follows at December 31, 2020:
2021$44 
202234 
202325 
202417 
202511 
Thereafter32 
Total lease payments$163 
Less: Imputed interest(25)
Present value of lease liabilities$138 

December 31,20202019
Right-of-use assets obtained in exchange for operating lease obligations$35 $26 
Weighted-average remaining lease term in years66
Weighted-average discount rate5.6 %5.9 %