Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Feb. 24, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 22, 2013
Intangible assets, accumulated amortization		$ 26	$ 7
Common Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01
Preferred Stock, Par or Stated Value Per Share		$ 0.01	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized		10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Shares Issued		0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Common Class A [Member]
Common Stock, Par or Stated Value Per Share		$ 0.01		$ 0.01
Common Stock, Shares Authorized		500,000,000	500,000,000	500,000,000
Common Stock, Shares, Issued		34,586,250	22,511,250
Common Class B [Member]
Common Stock, Par or Stated Value Per Share				$ 0.01
Common Stock, Shares Authorized		500,000,000	500,000,000	500,000,000
Common Stock, Shares, Issued		42,738,750	42,738,750

Face amount or stated value per share of common stock.

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