CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2017	Oct. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Net income (loss)	$ (141)		$ 341	$ 284
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	282		1,704
Deferred income taxes	270		175
Net long-term debt issuance costs and premium amortization	(5)		(30)
Loss on modification and extinguishment of debt	0		0
Share-based compensation	26		0
Accrued interest on long-term debt, net	27		(14)
Changes in current assets and liabilities:
Accounts receivable	(1)		46
Accounts payable	35		(37)
Deferred revenue	(15)		71
Other current assets and liabilities	(100)		4
Other current assets and liabilities, affiliates	(17)		216
Changes in other noncurrent assets and liabilities, net	(38)		(93)
Other, net	(15)		14
Net cash provided by operating activities	308		2,397
INVESTING ACTIVITIES
Capital expenditures	(207)		(1,038)
Purchase of marketable securities	0		0
Maturity of marketable securities	0		0
Proceeds from sale of property, plant and equipment and other assets	0		134
Note receivable - affiliate	(1,825)		0
Net cash used in investing activities	(2,032)		(904)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	0		0
Payments of long-term debt	(1)		(7)
Distributions	(250)		(1,545)
Other	(2)		0
Net cash used in financing activities	(253)		(1,552)
Net (decrease) increase in cash, cash equivalents, restricted cash and securities	(1,977)		(59)
Cash, cash equivalents, restricted cash and securities at beginning of period	2,308		331
Cash, cash equivalents, restricted cash and securities at end of period	331	$ 2,308	272	331
Supplemental cash flow information:
Income taxes paid, net	10		33
Interest paid	56		542
Cash, cash equivalents, restricted cash and securities:
Total	331	2,308	$ 331	331		$ 2,308
Predecessor
OPERATING ACTIVITIES
Net income (loss)		425			$ 677
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		1,018			1,159
Deferred income taxes		217			123
Net long-term debt issuance costs and premium amortization		14			21
Loss on modification and extinguishment of debt		44			40
Share-based compensation		132			156
Accrued interest on long-term debt, net		(47)			21
Changes in current assets and liabilities:
Accounts receivable		(16)			31
Accounts payable		(102)			83
Deferred revenue		146			18
Other current assets and liabilities		70			26
Other current assets and liabilities, affiliates		0			0
Changes in other noncurrent assets and liabilities, net		8			(9)
Other, net		5			(3)
Net cash provided by operating activities		1,914			2,343
INVESTING ACTIVITIES
Capital expenditures		(1,119)			(1,334)
Purchase of marketable securities		(1,127)			0
Maturity of marketable securities		1,127			0
Proceeds from sale of property, plant and equipment and other assets		1			3
Note receivable - affiliate		0			0
Net cash used in investing activities		(1,118)			(1,331)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt		4,569			764
Payments of long-term debt		(4,917)			(820)
Distributions		0			0
Other		3			(3)
Net cash used in financing activities		(345)			(59)
Net (decrease) increase in cash, cash equivalents, restricted cash and securities		451		953	953
Cash, cash equivalents, restricted cash and securities at beginning of period	2,308	1,857		1,857	904
Cash, cash equivalents, restricted cash and securities at end of period		2,308			1,857
Supplemental cash flow information:
Income taxes paid, net		49		35
Interest paid		468		508
Cash, cash equivalents, restricted cash and securities:
Cash and cash equivalents						2,274	$ 1,819
Restricted cash and securities - current						5	7
Restricted cash and securities - noncurrent						29	31
Total	$ 2,308	$ 1,857		$ 1,857	$ 904	$ 2,308	$ 1,857