Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Summary of the fair value of financial instruments

The estimated fair values of our other financial instruments at December 31, 2017 and 2016 have been calculated based upon available market information or an appropriate valuation technique, and are as follows:

	December 31, 2017				December 31, 2016
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Level 1:
Senior and senior subordinated notes	$	7,008	$	7,340	$	5,506	$	5,715
Level 3:
Capital leases (1)	67		65		71		70

(1) The fair value of capital leases reflects the present value of the leases using a 7.0 percent interest rate.