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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair value of financial instruments The estimated fair values of our other financial instruments, all of which are categorized in Level 1 of the fair value hierarchy, as of June 30, 2020 and December 31, 2019 have been calculated based upon available market information, and were as follows: 
 June 30, 2020December 31, 2019
 Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Senior notes$8,500  $8,718  $7,755  $8,176