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Operating Segments and Concentrations of Credit Risk (Tables) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
| Year Ended December 31, 2021
| Towers |  | Fiber |  | Other |  | Consolidated Total
Segment site rental revenues | $ | 3,804 |  |  | $ | 1,915 |  |  |  |  | $ | 5,719 |
Segment services and other revenues | 601 |  |  | 20 |  |  |  |  | 621 |
Segment revenues | 4,405 |  |  | 1,935 |  |  |  |  | 6,340 |
Segment site rental costs of operations | 889 |  |  | 633 |  |  |  |  | 1,522 |
Segment services and other costs of operations | 414 |  |  | 17 |  |  |  |  | 431 |
Segment costs of operations(a)(b) | 1,303 |  |  | 650 |  |  |  |  | 1,953 |
Segment site rental gross margin | 2,915 |  |  | 1,282 |  |  |  |  | 4,197 |
Segment services and other gross margin | 187 |  |  | 3 |  |  |  |  | 190 |
Segment selling, general and administrative expenses(b) | 107 |  |  | 174 |  |  |  |  | 281 |
Segment operating profit (loss) | 2,995 |  |  | 1,111 |  |  |  |  | 4,106 |
Other selling, general and administrative expenses(b) |  |  |  |  | $ | 290 |  |  | 290 |
Stock-based compensation expense |  |  |  |  | 131 |  |  | 131 |
Depreciation, amortization and accretion |  |  |  |  | 1,644 |  |  | 1,644 |
Interest expense and amortization of deferred financing costs |  |  |  |  | 657 |  |  | 657 |
Other (income) expenses to reconcile to income (loss) before income taxes(c) |  |  |  |  | 205 |  |  | 205 |
Income (loss) before income taxes |  |  |  |  |  |  | $ | 1,179 |
Capital expenditures | $ | 221 |  |  | $ | 956 |  |  | $ | 52 |  |  | $ | 1,229 |
Total assets (at year end) | $ | 22,318 |  |  | $ | 15,876 |  |  | $ | 846 |  |  | $ | 39,040 |
Total goodwill (at year end) | $ | 5,127 |  |  | $ | 4,951 |  |  | $ | — |  |  | $ | 10,078 |
(a)Exclusive of depreciation, amortization and accretion shown separately. (b)Segment costs of operations for the year ended December 31, 2021 excludes (1) stock-based compensation expense of $22 million and (2) prepaid lease purchase price adjustments of $18 million. For the year ended December 31, 2021, segment selling, general and administrative expenses exclude stock-based compensation expense of $109 million. (c)See consolidated statement of operations for further information. |
| Year Ended December 31, 2020
| Towers |  | Fiber |  | Other |  | Consolidated Total
Segment site rental revenues | $ | 3,497 |  |  | $ | 1,823 |  |  |  |  | $ | 5,320 |
Segment services and other revenues | 500 |  |  | 20 |  |  |  |  | 520 |
Segment revenues | 3,997 |  |  | 1,843 |  |  |  |  | 5,840 |
Segment site rental costs of operations | 866 |  |  | 620 |  |  |  |  | 1,486 |
Segment services and other costs of operations | 429 |  |  | 12 |  |  |  |  | 441 |
Segment costs of operations(a)(b) | 1,295 |  |  | 632 |  |  |  |  | 1,927 |
Segment site rental gross margin | 2,631 |  |  | 1,203 |  |  |  |  | 3,834 |
Segment services and other gross margin | 71 |  |  | 8 |  |  |  |  | 79 |
Segment selling, general and administrative expenses(b) | 100 |  |  | 186 |  |  |  |  | 286 |
Segment other operating (income) expense(c) | — |  |  | (362) |  |  |  |  | (362) |
Segment operating profit (loss) | 2,602 |  |  | 1,387 |  |  |  |  | 3,989 |
Other selling, general and administrative expenses(b) |  |  |  |  | $ | 283 |  |  | 283 |
Stock-based compensation expense |  |  |  |  | 133 |  |  | 133 |
Depreciation, amortization and accretion |  |  |  |  | 1,608 |  |  | 1,608 |
Interest expense and amortization of deferred financing costs |  |  |  |  | 689 |  |  | 689 |
Other (income) expenses to reconcile to income (loss) before income taxes(d) |  |  |  |  | 200 |  |  | 200 |
Income (loss) before income taxes |  |  |  |  |  |  | $ | 1,076 |
Capital expenditures | $ | 335 |  |  | $ | 1,232 |  |  | $ | 57 |  |  | $ | 1,624 |
Total assets (at year end) | $ | 22,242 |  |  | $ | 15,746 |  |  | $ | 780 |  |  | $ | 38,768 |
Total goodwill (at year end) | $ | 5,127 |  |  | $ | 4,951 |  |  | $ | — |  |  | $ | 10,078 |
(a)Exclusive of depreciation, amortization and accretion shown separately. (b)Segment costs of operations for the year ended December 31, 2020 excludes (1) stock-based compensation expense of $24 million and (2) prepaid lease purchase price adjustments of $18 million. For the year ended December 31, 2020, segment selling, general and administrative expenses exclude stock-based compensation expense of $109 million. (c)See note 15 for further information. (d)See consolidated statement of operations for further information. |
| Year Ended December 31, 2019
| Towers |  | Fiber |  | Other |  | Consolidated Total
Segment site rental revenues | $ | 3,389 |  |  | $ | 1,704 |  |  |  |  | $ | 5,093 |
Segment services and other revenues | 653 |  |  | 17 |  |  |  |  | 670 |
Segment revenues | 4,042 |  |  | 1,721 |  |  |  |  | 5,763 |
Segment site rental costs of operations | 864 |  |  | 559 |  |  |  |  | 1,423 |
Segment services and other costs of operations | 506 |  |  | 11 |  |  |  |  | 517 |
Segment costs of operations(a)(b) | 1,370 |  |  | 570 |  |  |  |  | 1,940 |
Segment site rental gross margin | 2,525 |  |  | 1,145 |  |  |  |  | 3,670 |
Segment services and other gross margin | 147 |  |  | 6 |  |  |  |  | 153 |
Segment selling, general and administrative expenses(b) | 96 |  |  | 195 |  |  |  |  | 291 |
Segment operating profit (loss) | 2,576 |  |  | 956 |  |  |  |  | 3,532 |
Other selling, general and administrative expenses(b) |  |  |  |  | $ | 233 |  |  | 233 |
Stock-based compensation expense |  |  |  |  | 116 |  |  | 116 |
Depreciation, amortization and accretion |  |  |  |  | 1,572 |  |  | 1,572 |
Interest expense and amortization of deferred financing costs |  |  |  |  | 683 |  |  | 683 |
Other (income) expenses to reconcile to income (loss) before income taxes(c) |  |  |  |  | 47 |  |  | 47 |
Income (loss) before income taxes |  |  |  |  |  |  | $ | 881 |
Capital expenditures | $ | 543 |  |  | $ | 1,473 |  |  | $ | 41 |  |  | $ | 2,057 |
Total assets (at year end) | $ | 22,357 |  |  | $ | 15,389 |  |  | $ | 711 |  |  | $ | 38,457 |
Total goodwill (at year end) | $ | 5,127 |  |  | $ | 4,951 |  |  | $ | — |  |  | $ | 10,078 |
(a)Exclusive of depreciation, amortization and accretion shown separately. (b)Segment costs of operations for the year ended December 31, 2019 excludes (1) stock-based compensation expense of $26 million and (2) prepaid lease purchase price adjustments of $20 million. For the year ended December 31, 2019, segment selling, general and administrative expenses exclude stock-based compensation expense of $90 million. (c)See consolidated statement of operations for further information.
A Summary of the Percentage of the Consolidated Revenues for Those Customers Accounting for More than 10% of the Consolidated Revenues | The following table summarizes the percentage of the consolidated revenues for those tenants accounting for more than 10% of the consolidated revenues.
| Years Ended December 31,
| 2021 |  | 2020(a) |  | 2019
T-Mobile | 35 | % |  | 36 | % |  | 22 | %
AT&T | 20 | % |  | 22 | % |  | 21 | %
Verizon Wireless | 20 | % |  | 19 | % |  | 19 | %
Sprint | — | % |  | — | % |  | 14 | %
Total | 75 | % |  | 77 | % |  | 76 | %
(a)For the year ended December 31, 2020, revenues attributable to T-Mobile include revenues previously derived from Sprint. On April 1, 2020, T-Mobile and Sprint announced the completion of their previously disclosed merger. |  |

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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 + Details
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