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Fair Value Disclosures (Tables)
3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Estimated Fair Values and Carrying Amounts of Assets and Liabilities
Level in Fair Value HierarchyMarch 31, 2022December 31, 2021
Carrying
 Amount
Fair
Value
Carrying
 Amount
Fair
Value
Assets:
Cash and cash equivalents1$312 $312 $292 $292 
Restricted cash, current and non-current1170 170 174 174 
Liabilities:
Total debt and other obligations221,126 20,472 20,629 21,588