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Operating Segments Operating Segments (Tables) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
| Three Months Ended June 30, 2018 |  | Three Months Ended June 30, 2017
| Towers |  | Fiber |  | Other |  | Consolidated Total |  | Towers |  | Fiber |  | Other |  | Consolidated Total
Segment site rental revenues | $ | 771 |  |  | $ | 398 |  |  |  |  | $ | 1,169 |  |  | $ | 718 |  |  | $ | 151 |  |  |  |  | $ | 869 |
Segment network services and other revenues | 158 |  |  | 3 |  |  |  |  | 161 |  |  | 158 |  |  | 11 |  |  |  |  | 169 |
Segment revenues | 929 |  |  | 401 |  |  |  |  | 1,330 |  |  | 876 |  |  | 162 |  |  |  |  | 1,038 |
Segment site rental cost of operations | 216 |  |  | 130 |  |  |  |  | 346 |  |  | 211 |  |  | 52 |  |  |  |  | 263 |
Segment network services and other cost of operations | 94 |  |  | 3 |  |  |  |  | 97 |  |  | 96 |  |  | 8 |  |  |  |  | 104 |
Segment cost of operations(a)(b) | 310 |  |  | 133 |  |  |  |  | 443 |  |  | 307 |  |  | 60 |  |  |  |  | 367 |
Segment site rental gross margin | 555 |  |  | 268 |  |  |  |  | 823 |  |  | 507 |  |  | 99 |  |  |  |  | 606 |
Segment network services and other gross margin | 64 |  |  | — |  |  |  |  | 64 |  |  | 62 |  |  | 3 |  |  |  |  | 65 |
Segment general and administrative expenses(b) | 27 |  |  | 44 |  |  |  |  | 71 |  |  | 23 |  |  | 19 |  |  |  |  | 42 |
Segment operating profit (loss) | 592 |  |  | 224 |  |  |  |  | 816 |  |  | 546 |  |  | 83 |  |  |  |  | 629 |
Other general and administrative expenses(b) |  |  |  |  | $ | 47 |  |  | 47 |  |  |  |  |  |  | $ | 41 |  |  | 41 |
Stock-based compensation expense |  |  |  |  | 26 |  |  | 26 |  |  |  |  |  |  | 17 |  |  | 17 |
Depreciation, amortization and accretion |  |  |  |  | 379 |  |  | 379 |  |  |  |  |  |  | 296 |  |  | 296 |
Interest expense and amortization of deferred financing costs |  |  |  |  | 158 |  |  | 158 |  |  |  |  |  |  | 142 |  |  | 142 |
Other income (expenses) to reconcile to income (loss) before income taxes(c) |  |  |  |  | 21 |  |  | 21 |  |  |  |  |  |  | 16 |  |  | 16 |
Income (loss) before income taxes |  |  |  |  |  |  | $ | 185 |  |  |  |  |  |  |  |  | $ | 117 |
Capital expenditures | $ | 98 |  |  | $ | 289 |  |  | $ | 6 |  |  | $ | 393 |  |  | $ | 107 |  |  | $ | 188 |  |  | $ | 6 |  |  | $ | 301 |
Total assets (at period end) | $ | 17,780 |  |  | $ | 14,100 |  |  | $ | 494 |  |  | $ | 32,374 |  |  | $ | 18,208 |  |  | $ | 5,811 |  |  | $ | 465 |  |  | $ | 24,484 |
(a) | Exclusive of depreciation, amortization and accretion shown separately.
(b) | Segment cost of operations excludes (1) stock-based compensation expense of $6 million and $2 million for the three months ended June 30, 2018 and 2017, respectively, and (2) prepaid lease purchase price adjustments of $5 million for both of the three months ended June 30, 2018 and 2017. General and administrative expenses exclude stock-based compensation expense of $20 million and $15 million for the three months ended June 30, 2018 and 2017, respectively.
(c) | See condensed consolidated statement of operations for further information.
| Six Months Ended June 30, 2018 |  | Six Months Ended June 30, 2017
| Towers |  | Fiber |  | Other |  | Consolidated Total |  | Towers |  | Fiber |  | Other |  | Consolidated Total
Segment site rental revenues | $ | 1,536 |  |  | $ | 787 |  |  |  |  | $ | 2,323 |  |  | $ | 1,434 |  |  | $ | 292 |  |  |  |  | $ | 1,726 |
Segment network services and other revenues | 300 |  |  | 7 |  |  |  |  | 307 |  |  | 308 |  |  | 20 |  |  |  |  | 328 |
Segment revenues | 1,836 |  |  | 794 |  |  |  |  | 2,630 |  |  | 1,742 |  |  | 312 |  |  |  |  | 2,054 |
Segment site rental cost of operations | 427 |  |  | 256 |  |  |  |  | 683 |  |  | 420 |  |  | 99 |  |  |  |  | 519 |
Segment network services and other cost of operations | 176 |  |  | 5 |  |  |  |  | 181 |  |  | 185 |  |  | 17 |  |  |  |  | 202 |
Segment cost of operations(a)(b) | 603 |  |  | 261 |  |  |  |  | 864 |  |  | 605 |  |  | 116 |  |  |  |  | 721 |
Segment site rental gross margin | 1,109 |  |  | 531 |  |  |  |  | 1,640 |  |  | 1,014 |  |  | 193 |  |  |  |  | 1,207 |
Segment network services and other gross margin | 124 |  |  | 2 |  |  |  |  | 126 |  |  | 123 |  |  | 3 |  |  |  |  | 126 |
Segment general and administrative expenses(b) | 53 |  |  | 87 |  |  |  |  | 140 |  |  | 47 |  |  | 36 |  |  |  |  | 83 |
Segment operating profit (loss) | 1,180 |  |  | 446 |  |  |  |  | 1,626 |  |  | 1,090 |  |  | 160 |  |  |  |  | 1,250 |
Other general and administrative expenses(b) |  |  |  |  | $ | 94 |  |  | 94 |  |  |  |  |  |  | $ | 80 |  |  | 80 |
Stock-based compensation expense |  |  |  |  | 52 |  |  | 52 |  |  |  |  |  |  | 42 |  |  | 42 |
Depreciation, amortization and accretion |  |  |  |  | 753 |  |  | 753 |  |  |  |  |  |  | 584 |  |  | 584 |
Interest expense and amortization of deferred financing costs |  |  |  |  | 318 |  |  | 318 |  |  |  |  |  |  | 276 |  |  | 276 |
Other income (expenses) to reconcile to income (loss) before income taxes(c) |  |  |  |  | 106 |  |  | 106 |  |  |  |  |  |  | 28 |  |  | 28 |
Income (loss) before income taxes |  |  |  |  |  |  | $ | 303 |  |  |  |  |  |  |  |  | $ | 240 |
Capital expenditures | $ | 195 |  |  | $ | 552 |  |  | $ | 16 |  |  | $ | 763 |  |  | $ | 208 |  |  | $ | 342 |  |  | $ | 13 |  |  | $ | 563 |
(a) | Exclusive of depreciation, amortization and accretion shown separately.
(b) | Segment cost of operations excludes (1) stock-based compensation expense of $13 million and $6 million for the six months ended June 30, 2018 and 2017, respectively, and (2) prepaid lease purchase price adjustments of $10 million for both of the six months ended June 30, 2018 and 2017. General and administrative expenses exclude stock-based compensation expense of $39 million and $36 million for the six months ended June 30, 2018 and 2017, respectively.
(c) | See condensed consolidated statement of operations for further information.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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