Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Carrying Values and Fair Values of Long-term Debt

The carrying amounts and fair values of our assets measured at fair value on a recurring basis included in our Consolidated Balance Sheets were as follows:

	Level within the Fair Value Hierarchy	December 31, 2018				December 31, 2017
(in millions)		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Deferred purchase price assets	3	$	746	$	746	$	745	$	745

The carrying amounts and fair values of our short-term and long-term debt included in our Consolidated Balance Sheets were as follows:

	Level within the Fair Value Hierarchy	December 31, 2018				December 31, 2017
(in millions)		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Liabilities:
Senior Notes to third parties	1	$	10,950	$	10,945	$	11,910	$	12,540
Senior Notes to affiliates	2	9,984		9,802		7,486		7,852
Incremental Term Loan Facility to affiliates	2	4,000		3,976		4,000		4,020
Senior Reset Notes to affiliates	2	598		640		3,100		3,260