Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net revenues:
Site Rental		$ 1,260	$ 1,184	$ 3,718	$ 3,507
Services and other		254	191	700	497
Net Revenues		1,514	1,375	4,418	4,004
Operating expenses:
Site rental	[1]	369	355	1,095	1,057
Services and other	[1]	147	119	410	304
Selling, general and administrative		150	145	457	418
Asset write-down charges		2	8	13	18
Acquisition and integration costs		4	4	10	18
Depreciation, amortization and accretion		389	385	1,176	1,138
Total operating expenses		1,061	1,016	3,161	2,953
Operating income (loss)		453	359	1,257	1,051
Nonoperating Income (Expense) [Abstract]
Interest expense and amortization of deferred financing costs		173	160	510	478
Gains (losses) on retirement of long-term obligations		0	(32)	(2)	(106)
Interest income		2	1	5	4
Other income (expense)		(5)	1	(6)	0
Income (loss) before income taxes		277	169	744	471
Benefit (provision) for income taxes		(5)	(5)	(15)	(13)
Net income (loss) attributable to CCIC stockholders		272	164	729	458
Dividends/distributions on preferred stock	[2]	(28)	(28)	(85)	(85)
Net income (loss) attributable to CCIC common stockholders		244	136	644	373
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments		0	0	0	(1)	[3]
Total other comprehensive income (loss)		0		0	(1)
Comprehensive income (loss) attributable to CCIC stockholders		$ 272	$ 164	$ 729	$ 457
Net income (loss) attributable to CCIC common stockholders, per common share:
Basic		$ 0.59	$ 0.33	$ 1.55	$ 0.90
Diluted		$ 0.58	$ 0.33	$ 1.54	$ 0.90
Weighted-average common shares outstanding (in millions):
Basic		416	415	416	413
Diluted		418	416	418	414

[1] Exclusive of depreciation, amortization and accretion shown separately.

[2] See note 7 for information regarding common and preferred stock dividends declared per share.

[3] See the condensed consolidated statement of operations and other comprehensive income (loss) for the components of other comprehensive income (loss).