Fair Value (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Carrying Amounts and Estimated Fair Values of Long-Term Financial Instruments

We believe the carrying values of our financial instruments related to current assets and current liabilities approximate fair value. The following table presents the carrying amounts and estimated fair values of our long-term financial instruments (in millions):

			June 30, 2016				December 31, 2015
	Hierarchy		Carrying		Fair		Carrying		Fair
	Level		Amount		Value		Amount		Value
Assets:
Other notes receivable		3	$	88	$	88	$	63	$	63
Total financial assets			$	88	$	88	$	63	$	63
Liabilities:
Long-term debt		1	$	2,380	$	2,499	$	2,144	$	2,178
Total financial liabilities			$	2,380	$	2,499	$	2,144	$	2,178
Off-Balance sheet:
Letters of credit		2	$	—	$	77	$	—	$	80
Surety bonds		2		—		13		—		32
Total off-balance sheet			$	—	$	90	$	—	$	112