CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net loss	$ (497)	$ (201)	$ (888)
Adjustments to reconcile to net cash provided by operating activities:
Contract intangible asset amortization		113	101
Depreciation and amortization	196	373	402
Share-based compensation expense		14	15
Loss on impairment	429		597
Loss on impairment of investment in unconsolidated affiliates			59
Loss on disposal of assets, net	(1)	58
(Gain) loss on retirement of debt	(4)	(51)	53
Deferred income tax expense		11	30
Other, net		14	32
Changes in deferred revenues, net		(72)	(10)
Changes in deferred costs, net		7	(4)
Changes in other operating assets and liabilities, net		(17)	(348)
Net cash provided by operating activities		249	39
Cash flows from investing activities
Capital expenditures		(100)	(153)
Proceeds from disposal of assets, net		7	3
Investments in loans to unconsolidated affiliates		(33)
Investments in unconsolidated affiliates			(6)
Net cash used in investing activities		(126)	(156)
Cash flows from financing activities
Repayments of debt		(239)	(1,009)
Proceeds from issuance of shares		66
Proceeds from issuance of debt, net of issue costs			743
Other, net		(20)	(18)
Net cash used in financing activities		(193)	(284)
Net decrease in unrestricted and restricted cash and cash equivalents		(70)	(401)
Unrestricted and restricted cash and cash equivalents, beginning of period		1,560	2,349
Unrestricted and restricted cash and cash equivalents, end of period	$ 1,948	$ 1,490	$ 1,948