Per Share Information (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income (loss)		$ 185	$ 193
Dividends/distributions on preferred stock	[1]	(28)	(28)
Net income (loss) attributable to CCIC common stockholders for basic and diluted computations		$ 157	$ 165
Basic weighted-average number of common stock outstanding		416	415
Effect of assumed dilution from potential issuance of common shares relating to restricted stock units		2	2
Diluted weighted-average number of common shares outstanding		418	417
Basic		$ 0.38	$ 0.40
Diluted		0.38	0.40
Dividends/distributions declared per share of common stock (in dollars per share)		1.20	1.125
Dividends/distributions declared per share of preferred stock		$ 17.1875	$ 17.1875

[1] See note 8 for information regarding common and preferred stock dividends declared per share.