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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

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