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Balance Sheet and Cash Flow Supplemental Information
 3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Balance Sheet and Cash Flow Supplemental Information Balance Sheet and Cash Flow Supplemental Information
Accrued liabilities consisted of the following:
March 31, 2021December 31, 2020
Employee-related costs and benefits$107 $133 
Related party payables1 7 
Interest31 21 
Sales rebates39 43 
Restructuring2 2 
Taxes other than income taxes17 16 
Asset retirement obligations7 9 
Interest rate swaps43 57 
Other accrued liabilities61 62 
Accrued liabilities$308 $350 
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