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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash and Cash Equivalents at Beginning of Period [1] $ 440 $ 697
Cash and Cash Equivalents at End of Period [1] 453 6,839
Cash flows from operating activities:    
Net income (loss) 458 346
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:    
Depreciation, amortization and accretion 1,138 880
(Gains) losses on retirement of long-term obligations 106 4
Amortization of deferred financing costs and other non-cash interest 5 8
Stock-based compensation expense 79 67
Asset write-down charges 18 10
Deferred income tax (benefit) provision 2 0
Other non-cash adjustments 2 (3)
Changes in assets and liabilities, excluding the effects of acquisitions:    
Increase (decrease) in accrued interest (31) 2
Increase (decrease) in accounts payable 31 (28)
Increase (decrease) in deferred revenues, deferred ground lease payables, other accrued liabilities and other liabilities 144 88
Decrease (increase) in receivables (74) 79
Decrease (increase) in prepaid expenses, deferred site rental receivables, long-term prepaid rent and other assets (103) (40)
Net cash provided by (used for) operating activities 1,775 1,413
Cash flows from investing activities:    
Payments for acquisitions, net of cash acquired (26) (2,113)
Capital expenditures (1,241) (852)
Other investing activities, net (14) (6)
Net cash provided by (used for) investing activities (1,281) (2,971)
Cash flows from financing activities:    
Proceeds from issuance of long-term debt 2,743 3,092
Principal payments on debt and other long-term obligations (76) (90)
Purchases and redemptions of long-term debt (2,346) 0
Borrowings under revolving credit facility 1,290 1,755
Payments under revolving credit facility (1,465) (1,755)
Payments for financing costs (33) (27)
Proceeds from Issuance of Common Stock 841 4,221
Proceeds from Issuance of Convertible Preferred Stock 0 1,608
Purchases of Common Stock (34) (23)
Dividends/distributions paid on common stock (1,315) (1,082)
Dividends paid on preferred stock (85) 0
Net cash provided by (used for) financing activities (480) 7,699
Net increase (decrease) in cash, cash equivalents, and restricted cash 14 6,141
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]    
Effect of exchange rate changes on cash $ (1) $ 1
[1] See "Recently Adopted Accounting Pronouncements" in note 2 to the condensed consolidated financial statements for a discussion of recently adopted restricted cash guidance, which impacted certain presentations on the condensed consolidated statement of cash flows.