Condensed Consolidated Balance Sheet - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets, Current [Abstract]
Cash and cash equivalents	$ 339	$ 232
Restricted cash, current	181	144
Receivables, net	434	431
Prepaid expenses	148	95
Other current assets	227	202
Assets, Current, Total	1,329	1,104
Deferred site rental receivables	1,425	1,408
Property and equipment, net of accumulated depreciation of $11,365 and $10,803, respectively	15,178	15,162
Operating lease right-of-use assets	6,618	6,464
Goodwill	10,078	10,078
Other intangible assets, net	4,222	4,433
Other assets, net	123	119
Assets, Total	38,973	38,768
Liabilities, Current [Abstract]
Accounts payable	219	230
Accrued interest	179	199
Deferred revenues	805	704
Other accrued liabilities	406	378
Current maturities of debt and other obligations	71	129
Current portion of operating lease liabilities	338	329
Liabilities, Current, Total	2,018	1,969
Debt and other long-term obligations	20,014	19,151
Operating lease liabilities	5,963	5,808
Other long-term liabilities	2,265	2,379
Liabilities, Total	$ 30,260	$ 29,307
Common stock, par value	$ 0.01	$ 0.01
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock, Value, Issued	$ 4	$ 4
Additional Paid in Capital	17,951	17,933
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2)	(4)
Retained Earnings (Accumulated Deficit)	(9,240)	(8,472)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total	8,713	9,461
Liabilities and Equity, Total	$ 38,973	$ 38,768