Fair Value Disclosures (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures

Estimated Fair Values and Carrying Amounts of Assets and Liabilities

	Level in Fair Value Hierarchy	March 31, 2018				December 31, 2017
		Carrying  Amount		Fair Value		Carrying  Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	220	$	220	$	314	$	314
Restricted cash, current and non-current	1	125		125		126		126
Liabilities:
Total debt and other obligations	2	15,746		15,870		16,159		16,644