Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended																6 Months Ended		9 Months Ended		12 Months Ended
		Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019	[1]	Mar. 31, 2019	[1]	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Net Revenues		$ 1,426	[1]	$ 1,482	[1]	$ 1,447		$ 1,408		$ 1,406		$ 1,361		$ 1,319		$ 1,284		$ 2,855	$ 2,604	$ 4,337	$ 3,964	$ 5,763		$ 5,370		$ 4,255
Operating income (loss)		379	[1]	423	[1]	389		367		367		346		335		335		756	670	1,180	1,014	1,559		1,383		967
Gains (losses) on retirement of long-term obligations		0	[1]	0	[1]	(1)		(1)		0		(32)		(3)		(71)		(2)	(74)	(2)	(106)	(2)	[2]	(106)	[2]	(4)	[3]
Benefit (provision) for income taxes		(6)	[1]	(5)		(4)		(6)		(5)		(5)		(5)		(4)		(10)	(9)	(15)	(13)	(21)		(19)		(26)
Net income (loss) attributable to CCIC stockholders	[1]	$ 208
Net income (loss)				$ 242	[1]	$ 216		$ 193		$ 201		$ 151		$ 170		$ 100		$ 409	$ 270	$ 652	$ 421	$ 860		$ 622		$ 366
Net income (loss) attributable to CCIC common stockholders, per common share:
Basic (in dollars per share)		$ 0.43	[1]	$ 0.51	[1]	$ 0.45		$ 0.40		$ 0.42		$ 0.30		$ 0.34		$ 0.18		$ 0.85	$ 0.52	$ 1.36	$ 0.81	$ 1.80		$ 1.23		$ 0.80
Diluted (in dollars per share)		$ 0.43	[1]	$ 0.51	[1]	$ 0.45		$ 0.40		$ 0.42		$ 0.30		$ 0.34		$ 0.18		$ 0.84	$ 0.52	$ 1.36	$ 0.81	$ 1.79		$ 1.23		$ 0.80

[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 represent write-off of deferred financing costs.