CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net loss	$ (825)	$ (529)	$ (1,202)
Adjustments to reconcile to net cash provided by operating activities:
Contract intangible asset amortization		158	140
Depreciation and amortization	212	592	648
Share-based compensation expense		24	28
Loss on impairment	583	597	584
Loss on impairment of investment in unconsolidated affiliate		59
Loss on disposal of assets, net	4	64	7
Gain (loss) on restructuring and retirement of debt	12	(396)	39
Deferred income tax expense		28	139
Other, net		42	28
Changes in deferred revenues, net		(45)	19
Changes in deferred costs, net		10	(21)
Changes in other operating assets and liabilities, net		(484)	(216)
Net cash provided by operating activities		120	193
Cash flows from investing activities
Capital expenditures		(218)	(259)
Proceeds from disposal of assets, net		15	52
Investments in unconsolidated affiliates		(17)	(77)
Proceeds from maturities of unrestricted and restricted investments			123
Other, net			3
Net cash used in investing activities		(220)	(158)
Cash flows from financing activities
Proceeds from issuance of debt, net of discounts and issue costs		743	1,056
Repayments of debt		(1,135)	(1,189)
Other, net		(27)	(34)
Net cash used in financing activities		(419)	(167)
Net decrease in unrestricted and restricted cash and cash equivalents		(519)	(132)
Unrestricted and restricted cash and cash equivalents, beginning of period		2,349	2,589
Unrestricted and restricted cash and cash equivalents, end of period	$ 2,457	$ 1,830	$ 2,457