Long-Term Incentive Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Compensation expense	$ 5	$ 2	$ 15	$ 19
Unrecognized compensation expense	57		57
Additional unrecognized compensation cost to be recognized in rest of 2015	5		5
Unrecognized compensation cost to be recognized over the remaining requisite service periods subsequent to 2015	36		36
Unrecognized compensation cost to be recognized upon a specified capital transaction	$ 16		$ 16
Restricted stock
Number of Shares
Non-vested at December 31, 2014 (in shares)			1,033,394
Granted (in shares)			3,628,479
Vested (in shares)			(331,682)
Forfeited (in shares)			(363,536)
Non-vested at September 30, 2015 (in shares)	3,966,655		3,966,655
Weighted Average Grant Date Fair Value per Share
Nonvested (in dollars per share)	$ 11.07		$ 11.07		$ 19.80
Granted (in dollars per share)			9.46
Vested (in dollars per share)			19.63
Forfeitures (in dollars per share)			$ 12.05