Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Measurements [Abstract]

Carrying Amount And Estimated Fair Values Of Financial Instruments

	December 31, 2015				December 31, 2014
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
	(in millions)
Cash and cash equivalents	$	15	$	15	$	53	$	53
Credit facility		116		116		300		300
Term loan facility		750		750		500		500
Bridge facility		–		–		4,500		4,500
Senior notes		3,863		2,672		1,667		1,751
Derivative instruments, net		(2)		(2)		316		316

Summary Assets And Liabilities Measured At Fair Value On Recurring Basis

	December 31, 2015
	Fair Value Measurements Using:
	Quoted Prices		Significant
	in Active		Other		Significant
	Markets		Observable Inputs		Unobservable Inputs		Assets (Liabilities)
	(Level 1)		(Level 2)		(Level 3)		at Fair Value
Fixed price swap assets	$	–	$	–	$	–	$	–
Interest rate swap assets		–		–		–		–
Basis swap assets		–		–		3		3
Interest rate swap liabilities		–		(5)		–		(5)
Basis swap liabilities		–		–		–		–
Fixed price call option liabilities		–		–		–		–
Total	$	–	$	(5)	$	3	$	(2)
	December 31, 2014
	Fair Value Measurements Using:
	Quoted Prices		Significant
	in Active		Other		Significant
	Markets		Observable Inputs		Unobservable Inputs		Assets (Liabilities)
	(Level 1)		(Level 2)		(Level 3)		at Fair Value
Fixed price swap assets	$	–	$	328	$	–	$	328
Interest rate swap assets		–		1		–		1
Basis swap assets		–		–		10		10
Interest rate swap liabilities		–		(5)		–		(5)
Basis swap liabilities		–		–		(6)		(6)
Fixed price call option liabilities		–		–		(12)		(12)
Total	$	–	$	324	$	(8)	$	316

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 years ended
	December 31,
	2015		2014
	(in millions)
Balance at beginning of year	$	(8)	$	(19)
Total gains (losses):
Included in earnings		9		23
Included in other comprehensive income		–		–
Purchases, issuances, and settlements:
Purchases		–		–
Issuances		–		–
Settlements		2		(12)
Transfers into/out of Level 3		–		–
Balance at end of year	$	3	$	(8)
Change in gains (losses) included in earnings relating to derivatives still held as of December 31	$	11	$	11