Quarterly Financial Data (Unaudited) (Details) (USD $)	3 Months Ended																		12 Months Ended		0 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012	Mar. 31, 2015	Dec. 31, 2013	Jul. 10, 2013		Jul. 10, 2013	Dec. 31, 2012
Successor [Member]
Quarterly Financial Data [Line Items]
Revenues	$ 8,292,000,000		$ 8,973,000,000		$ 8,488,000,000		$ 8,789,000,000		$ 8,875,000,000	$ 9,142,000,000		$ 7,749,000,000		$ 0		$ 0		$ 0	$ 34,532,000,000	$ 16,891,000,000
Operating income (loss)	318,000,000		(2,540,000,000)		(192,000,000)		519,000,000		420,000,000	(576,000,000)		(358,000,000)		(22,000,000)		(14,000,000)		(33,000,000)	(1,895,000,000)	(970,000,000)
Net loss	(224,000,000)		(2,379,000,000)		(765,000,000)		23,000,000		(151,000,000)	(1,038,000,000)		(699,000,000)		(114,000,000)		(9,000,000)		(27,000,000)	(3,345,000,000)	(1,860,000,000)
Basic and diluted net loss per common share	$ 0	[1]	$ (1)	[1]	$ 0	[1]	$ 0.01	[1]	$ (0.04)	$ (0.26)	[1]	$ (0.18)	[1]	$ 0.00	[1]	$ 0.00	[1]		$ (1)	$ (0.54)
Predecessor [Member]
Quarterly Financial Data [Line Items]
Revenues												8,877,000,000				8,793,000,000					932,000,000		18,602,000,000	35,345,000,000
Operating income (loss)												874,000,000				29,000,000					(40,000,000)		(885,000,000)	(1,820,000,000)
Net loss												$ (1,597,000,000)				$ (643,000,000)					$ 1,082,000,000		$ (1,158,000,000)	$ (4,326,000,000)
Basic and diluted net loss per common share																$ (0.21)							$ (0.38)	$ (1.44)
Basic (loss) income per common share												$ (0.53)	[1]			$ (0.21)	[1]				$ 0.35	[1]
Diluted (loss) income per common share												$ 0	[1]			$ 0	[1]				$ 0.30	[1]

[1] (1)The sum of the quarterly earnings per share amounts may not equal the annual amounts because of the changes in the weighted average number of shares outstanding during the year.