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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities      
Net loss $ (409) $ (1,760) $ (2,995)
Adjustments to reconcile to net cash provided by operating activities:      
Contract intangible asset amortization 29 78  
Depreciation 201 614 648
Share-based compensation expense   36 30
Loss on impairment 432 1,446 1,498
Loss on disposal of assets, net     1,602
Loss on retirement of debt 1 3 49
Deferred income tax expense (benefit)   50 32
Other, net   12 29
Changes in deferred revenues, net   (127) (109)
Changes in deferred costs, net   23 42
Changes in other operating assets and liabilities, net   (55) 100
Net cash provided by operating activities   320 926
Cash flows from investing activities      
Capital expenditures   (140) (386)
Proceeds from disposal of assets, net   37 330
Unrestricted and restricted cash acquired in business combination   131  
Investment in unconsolidated affiliates   (107)  
Deposits into short-term investments   (50)  
Proceeds from maturities of short-term investments   500  
Other, net     10
Net cash provided by (used in) investing activities   371 (46)
Cash flows from financing activities      
Proceeds from issuance of debt, net of discounts and issue costs   1,319 403
Repayments of debt   (2,015) (1,629)
Proceeds from investments restricted for financing activities   26 102
Payments to terminate derivative instruments   (92)  
Other, net   (29) (3)
Net cash used in financing activities   (791) (1,127)
Net decrease in unrestricted and restricted cash and cash equivalents   (100) (247)
Unrestricted and restricted cash and cash equivalents at beginning of period   2,975 3,433
Unrestricted and restricted cash and cash equivalents at end of period $ 2,875 $ 2,875 $ 3,186