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Balance Sheet and Cash Flow Supplemental Information (Tables)
3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Accrued Liabilities
Accrued liabilities consisted of the following:
March 31, 2021December 31, 2020
Employee-related costs and benefits$107 $133 
Related party payables
Interest31 21 
Sales rebates39 43 
Restructuring
Taxes other than income taxes17 16 
Asset retirement obligations
Interest rate swaps43 57 
Other accrued liabilities61 62 
Accrued liabilities$308 $350 
Schedule of Cash Flow, Supplemental Disclosures
Additional supplemental cash flow information for the three months ended March 31, 2021 and 2020 and as of March 31, 2021 and December 31, 2020 is as follows: 
Three Months Ended March 31,
Supplemental non cash information:20212020
Financing activities - Acquisition of noncontrolling interest$125 $— 
March 31, 2021December 31, 2020
Capital expenditures acquired but not yet paid$28 $37