Stockholder's Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Schedule of cash dividends declared

We declared the following cash dividend to QSC:

	Years Ended December 31,
	2019		2018	2017
	(Dollars in millions)
Cash dividend declared to QSC	$	1,600	1,275	1,000
Cash dividend paid to QSC	1,600		1,275	1,000