Stockholder's Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stockholder's Equity (Deficit)
Dividends declared to QSC	$ 1,350	$ 1,400	$ 1,325
Common stock, shares issued (shares)	1	1
Common stock, shares outstanding (shares)	1	1
Dividends
Cash dividend paid to QSC	$ 1,350	$ 1,400	$ 1,325
COMMON STOCK
Stockholder's Equity (Deficit)
Common stock, shares issued (shares)	1
Common stock, shares outstanding (shares)	1