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Restatement of Previously Issued Consolidated Financial Statements Restatement of Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
 [1]
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Site Rental Revenues   $ 1,287 $ 1,263 $ 1,242 $ 1,231 $ 1,205 $ 1,188 $ 1,171 $ 2,505 $ 2,360 $ 3,793 $ 3,565 $ 5,093 $ 4,796 $ 3,734
Services and other   195 184 166 175 156 131 113 350 244 544 399 670 574 521
Net Revenues $ 1,426 1,482 [1] 1,447 [1] 1,408 [1] 1,406 [1] 1,361 [1] 1,319 [1] 1,284 [1] 2,855 2,604 4,337 3,964 5,763 5,370 4,255
Services and other   146 137 124 135 [2] 118 [2] 98 [2] 85 [2] 261 183 [2] 407 301 [2] 524 [2] 434 [2] 399 [2]
Depreciation, amortization and accretion   388 393 394 389 385 379 374 787 753 1,175 1,138 1,572 1,527 1,241
Costs and Expenses   1,059 1,058 1,041 1,039 1,015 984 949 2,099 1,934 3,157 2,950 4,204 3,987 3,288
Operating income (loss) $ 379 423 [1] 389 [1] 367 [1] 367 [1] 346 [1] 335 [1] 335 [1] 756 670 1,180 1,014 1,559 1,383 967
Income (Loss) Attributable to Parent, before Tax   247 220 199 206 156 175 104 419 279 667 434 881 641 392
Net income (loss)   242 [1] 216 [1] 193 [1] 201 [1] 151 [1] 170 [1] 100 [1] 409 270 652 421 860 622 366
Net Income (Loss) Available to Common Stockholders, Basic   214 188 165 173 123 142 72 352 213 567 336 747 509 308
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ 242 $ 216 $ 193 $ 201 $ 151 $ 169 $ 100 $ 409 $ 269 $ 652 $ 420 $ 860 $ 621 $ 368
Basic (in dollars per share) $ 0.43 $ 0.51 [1] $ 0.45 [1] $ 0.40 [1] $ 0.42 [1] $ 0.30 [1] $ 0.34 [1] $ 0.18 [1] $ 0.85 $ 0.52 $ 1.36 $ 0.81 $ 1.80 $ 1.23 $ 0.80
Diluted (in dollars per share) $ 0.43 $ 0.51 [1] $ 0.45 [1] $ 0.40 [1] $ 0.42 [1] $ 0.30 [1] $ 0.34 [1] $ 0.18 [1] $ 0.84 $ 0.52 $ 1.36 $ 0.81 $ 1.79 $ 1.23 $ 0.80
Previously Reported [Member]                              
Site Rental Revenues   $ 1,260 $ 1,238 $ 1,219 $ 1,209 $ 1,184 $ 1,169 $ 1,153 $ 2,457 $ 2,323 $ 3,718 $ 3,507   $ 4,716 $ 3,669
Services and other   254 240 207 210 191 161 146 447 307 700 497   707 687
Net Revenues   1,514 1,478 1,426 1,419 1,375 1,330 1,299 2,904 2,630 4,418 4,004   5,423 4,356
Services and other   147 138 125   119 [2] 99 [2] 86 [2] 263 185 [2] 410 304 [2]   437 420
Depreciation, amortization and accretion   389     390           1,176     1,528 1,242
Costs and Expenses   1,061 1,059 1,042 1,040 1,016 985 950 2,101 1,936 3,161 2,953   3,991 3,310
Operating income (loss)   453 419 384 379 359 345 349 803 694 1,257 1,051   1,432 1,046
Income (Loss) Attributable to Parent, before Tax   277 250 216 218 169 185 118 466 303 744 471   690 471
Net income (loss)   272 246 210 213 164 180 114 456 294 729 458   671 445
Net Income (Loss) Available to Common Stockholders, Basic   244 218 182 185 136 152 86 399 237 644 373   558 387
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ 272 $ 246 $ 210 $ 213 $ 164 $ 179 $ 114 $ 456 $ 293 $ 729 $ 457   $ 670 $ 447
Basic (in dollars per share)   $ 0.59 $ 0.52 $ 0.44 $ 0.45 $ 0.33 $ 0.37 $ 0.21 $ 0.96 $ 0.58 $ 1.55 $ 0.90   $ 1.35 $ 1.01
Diluted (in dollars per share)   $ 0.58 $ 0.52 $ 0.44 $ 0.44 $ 0.33 $ 0.36 $ 0.21 $ 0.95 $ 0.57 $ 1.54 $ 0.90   $ 1.34 $ 1.01
Restatement Adjustment [Member]                              
Site Rental Revenues   $ 27 $ 25 $ 23 $ 22 $ 21 $ 19 $ 18 $ 48 $ 37 $ 75 $ 58   $ 80 $ 65
Services and other   (57) (55) (40) (35) (33) (28) (32) (95) (60) (152) (93)   (128) (124)
Net Revenues   (30) (30) (17) (13) (12) (9) (14) (47) (23) (77) (35)   (48) (59)
Services and other   0 0 0   0 [2] 0 [2] 0 [2] 0 0 [2] 0 0 [2]   0 0
Depreciation, amortization and accretion   0     0           0     0 0
Costs and Expenses   0 0 0 0 0 0 0 0 0 0 0   0 0
Operating income (loss)   (30) (30) (17) (13) (12) (9) (14) (47) (23) (77) (35)   (48) (59)
Income (Loss) Attributable to Parent, before Tax   (30) (30) (17) (13) (12) (9) (14) (47) (23) (77) (35)   (48) (59)
Net income (loss)   (30) (30) (17) (13) (12) (9) (14) (47) (23) (77) (35)   (48) (59)
Net Income (Loss) Available to Common Stockholders, Basic   (30) (30) (17) (13) (12) (9) (14) (47) (23) (77) (35)   (48) (59)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ (30) $ (30) $ (17) $ (13) $ (12) $ (9) $ (14) $ (47) $ (23) $ (77) $ (35)   $ (48) $ (59)
Basic (in dollars per share)   $ (0.08) $ (0.07) $ (0.04) $ (0.03) $ (0.03) $ (0.03) $ (0.03) $ (0.11) $ (0.06) $ (0.19) $ (0.09)   $ (0.12) $ (0.16)
Diluted (in dollars per share)   $ (0.07) $ (0.07) $ (0.04) $ (0.02) $ (0.03) $ (0.02) $ (0.03) $ (0.11) $ (0.05) $ (0.18) $ (0.09)   $ (0.11) $ (0.16)
Other Adjustments [Domain]                              
Site Rental Revenues         $ 0 $ 0 $ 0 $ 0   $ 0   $ 0   $ 0 $ 0
Services and other   $ (2) $ (1) $ (1) 0 (2) (2) (1) $ (2) (3) $ (4) (5)   (5) (42)
Net Revenues   (2) (1) (1) 0 (2) (2) (1) (2) (3) (4) (5)   (5) (42)
Services and other   (1) (1) (1)   (1) [2] (1) [2] (1) [2] (2) (2) [2] (3) (3) [2]   (3) (21)
Depreciation, amortization and accretion   (1)     (1)           (1)     (1) (1)
Costs and Expenses   $ (2) $ (1) $ (1) (1) (1) (1) (1) $ (2) (2) $ (4) (3)   (4) (22)
Operating income (loss)         1 (1) (1) 0   (1)   (2)   (1) (20)
Income (Loss) Attributable to Parent, before Tax         1 (1) (1) 0   (1)   (2)   (1) (20)
Net income (loss)         1 (1) (1) 0   (1)   (2)   (1) (20)
Net Income (Loss) Available to Common Stockholders, Basic         1 (1) (1) 0   (1)   (2)   (1) (20)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent         $ 1 $ (1) $ (1) $ 0   $ (1)   $ (2)   $ (1) $ (20)
Basic (in dollars per share)         $ 0 $ 0 $ 0 $ 0   $ 0   $ 0   $ 0 $ (0.05)
Diluted (in dollars per share)         $ 0 $ 0 $ 0 $ 0   $ 0   $ 0   $ 0 $ (0.05)
[1]
The sum of quarterly information may not agree to year-to-date information due to rounding.
[2]
Exclusive of depreciation, amortization and accretion shown separately.