Stockholder's Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended		3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2011 Predecessor
Stockholder's Equity (Deficit)
Common stock, shares issued (shares)			1
Common stock, shares outstanding (shares)			1	1
Tax benefit associated with deduction for pension funding recognized in equity contribution	$ 100			$ 100
Dividends
Non-cash dividend to QSC		28	0	0	0
Cash dividend declared to QSC		600	1,325	840	1,000
Cash dividend paid to QSC		$ 900	$ 1,325	$ 1,150	$ 530