Summary of Significant Accounting Policies - Business Description (Details)			12 Months Ended
	Oct. 15, 2015 USD ($) shares	Oct. 13, 2015 votes	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of common stock			$ 2,718,000,000	$ 0	$ 0
11.25% Senior unsecured notes due 2021
Debt Instrument [Line Items]
Principal amount	$ 510,000,000
Interest rate	11.25%		11.25%
12.625% Senior unsecured notes due 2021
Debt Instrument [Line Items]
Principal amount	$ 1,900,000,000.0
Interest rate	12.625%		12.625%
Class A Common Stock
Debt Instrument [Line Items]
Common stock, issued shares (in shares) | shares	176,076,869
Proceeds from issuance of common stock	$ 2,700,000,000
Reverse stock split conversion ratio	1
Class B Common Stock
Debt Instrument [Line Items]
Common stock votes per share entitled | votes		10
Reverse stock split conversion ratio		0.3164