Fair Value Disclosures (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures

Estimated Fair Values and Carrying Amounts of Assets and Liabilities

	Level in Fair Value Hierarchy	June 30, 2018				December 31, 2017
		Carrying  Amount		Fair Value		Carrying  Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	206	$	206	$	314	$	314
Restricted cash, current and non-current	1	130		130		126		126
Liabilities:
Total debt and other obligations	2	15,956		15,911		16,159		16,644