Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Measurements [Abstract]

Carrying Amount And Estimated Fair Values Of Financial Instruments

	March 31, 2016				December 31, 2015
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
	(in millions)
Cash and cash equivalents	$	1,597	$	1,597	$	15	$	15
Credit facility		1,852		1,852		116		116
Term loan facility		748		748		747		747
Senior notes		3,843		2,729		3,842		2,651
Derivative instruments, net		(23)		(23)		(2)		(2)

Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis

	March 31, 2016
	Fair Value Measurements Using:
	Quoted Prices		Significant		Significant
	in Active		Other		Unobservable
	Markets		Observable Inputs		Inputs		Assets (Liabilities)
	(Level 1)		(Level 2)		(Level 3)		at Fair Value
Fixed price swap assets	$	–	$	20	$	–	$	20
Purchased put option assets		–		–		15		15
Interest rate swap liabilities		–		(8)		–		(8)
Sold call option liabilities		–		–		(50)		(50)
Total	$	–	$	12	$	(35)	$	(23)
	December 31, 2015
	Fair Value Measurements Using:
	Quoted Prices		Significant		Significant
	in Active		Other		Unobservable
	Markets		Observable Inputs		Inputs		Assets (Liabilities)
	(Level 1)		(Level 2)		(Level 3)		at Fair Value
Basis swap assets	$	–	$	–	$	3	$	3
Interest rate swap liabilities		–		(5)		–		(5)
Total	$	–	$	(5)	$	3	$	(2)

Reconciliations For Change In Net Fair Value Of Derivative Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)

	For the three months ended
	March 31,
	2016		2015
	(in millions)
Balance at beginning of period	$	3	$	(8)
Total gains (losses):
Included in earnings		(34)		(6)
Purchases, issuances, and settlements:
Settlements		(4)		6
Transfers into/out of Level 3		–		–
Balance at end of period	$	(35)	$	(8)
Change in losses included in earnings relating to derivatives still held as of March 31	$	(38)	$	–