Stockholder's Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

Schedule of cash dividends declared

We declared the following cash dividend to QSC:

	Years Ended December 31,
	2018		2017	2016
	(Dollars in millions)
Cash dividend declared to QSC	$	1,275	1,000	1,300
Cash dividend paid to QSC	1,275		1,000	1,300