Consolidated Statements Of Cash Flows - USD ($) $ in Millions	4 Months Ended	5 Months Ended	9 Months Ended
	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2022
Successor [Member]
Cash flows provided from (used by) operating activities:
Net Income		$ 225	$ 286
Adjustments to reconcile net income to net cash provided from (used by) operating activities:
Depreciation and amortization		452	870
Pension settlement costs			50
Stock-based compensation expense		8	54
Lease Impairment			44
Bad debt expense		16	19
Other adjustments		(11)	(20)
Deferred income taxes		68	167
Change in accounts receivable		49	16
Change in pension and other post retirement liabilities		60	(527)
Change in accounts payable and other liabilities		89	94
Change in prepaid expenses, income taxes, and other assets		27	(12)
Net cash provided from (used by) operating activities		983	1,041
Cash flows provided from (used by) investing activities:
Capital expenditures		(646)	(1,860)
Proceeds on sale of assets			4
Purchase of short-term investments			(3,225)
Sale of short-term investments			900
Other		1	3
Net cash used by investing activities		(645)	(4,178)
Cash flows provided from (used by) financing activities:
Long-term debt principal payments		(8)	(11)
Proceeds from long-term debt borrowings			1,200
Financing costs paid			(17)
Finance lease obligation payments		(9)	(15)
Proceeds from financing lease transactions			70
Taxes paid on behalf of employees for shares withheld			(7)
Other			(1)
Net cash provided from (used by) financing activities		(17)	1,219
Increase (decrease) in cash, cash equivalents, and restricted cash		321	(1,918)
Cash, cash equivalents, and restricted cash at January 1,		940	2,178
Cash, cash equivalents, and restricted cash at September 30,	$ 940	1,261	260
Cash paid during the period for:
Interest		121	286
Income tax payments, net		27	$ 7
Predecessor [Member]
Cash flows provided from (used by) operating activities:
Net Income	4,541
Adjustments to reconcile net income to net cash provided from (used by) operating activities:
Depreciation and amortization	506
Stock-based compensation expense	(1)
Non-cash reorganization items, net	(5,467)
Provision for bad debts	14
Other adjustments	1
Deferred income taxes	(148)
Change in accounts receivable	36
Change in pension and other post retirement liabilities	(12)
Change in accounts payable and other liabilities	(156)
Change in prepaid expenses, income taxes, and other assets	46
Net cash provided from (used by) operating activities	(654)
Cash flows provided from (used by) investing activities:
Capital expenditures	(500)
Proceeds on sale of assets	9
Other	1
Net cash used by investing activities	(490)
Cash flows provided from (used by) financing activities:
Long-term debt principal payments	(1)
Proceeds from long-term debt borrowings	225
Financing costs paid	(4)
Finance lease obligation payments	(7)
Other	(16)
Net cash provided from (used by) financing activities	197
Increase (decrease) in cash, cash equivalents, and restricted cash	(947)
Cash, cash equivalents, and restricted cash at January 1,	1,887	$ 940
Cash, cash equivalents, and restricted cash at September 30,	940
Cash paid during the period for:
Interest	84
Income tax payments, net	9
Reorganization items, net	$ 1,397