Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017	[1]	Mar. 31, 2017	[1]	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
Net Revenues	$ 1,419		$ 1,375		$ 1,330		$ 1,299		$ 1,238	[1]	$ 1,063	[1]	$ 1,038		$ 1,016		$ 5,423		$ 4,356		$ 3,921
Operating income (loss)	379		359		345		349		267	[1]	261	[1]	259		257		1,432		1,046		949
Gains (losses) on retirement of long-term obligations	0		(32)		(3)		(71)		0	[1]	0	[1]	0		(4)		(106)	[2]	(4)	[3]	(52)	[4]
Benefit (provision) for income taxes	(5)		(5)		(5)		(4)		(15)	[1]	(2)	[1]	(5)		(4)		$ (19)		$ (26)		$ (17)
Net income (loss) attributable to CCIC stockholders	$ 185		$ 136		$ 152		$ 86		$ 98		$ 115		$ 112		$ 119
Net income (loss) attributable to CCIC common stockholders, per common share:
Basic (in dollars per share)	$ 0.45		$ 0.33		$ 0.37		$ 0.21		$ 0.17	[1]	$ 0.22	[1]	$ 0.31		$ 0.33		$ 1.35		$ 1.01		$ 0.95
Diluted (in dollars per share)	$ 0.44		$ 0.33		$ 0.36		$ 0.21		$ 0.17	[1]	$ 0.21	[1]	$ 0.31		$ 0.33		$ 1.34		$ 1.01		$ 0.95

[1] The sum of quarterly information may not agree to year to date information due to rounding.

[2] Inclusive of the write off of the respective deferred financing costs.

[3] The losses related to write off of deferred financing costs

[4] Inclusive of the write off of the respective deferred financing costs.