Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Successor [Member]
Current assets:
Cash and cash equivalents	$ 1,211
Accounts receivable, less allowances of $49 and $130, respectively	452
Prepaid expenses	94
Income taxes and other current assets	30
Total current assets	1,787
Property, plant and equipment, net	8,918
Other intangibles, net	4,307
Other assets	376
Total assets	15,388
Current liabilities:
Long-term debt due within one year	15
Accounts payable	583
Advanced billings	200
Accrued other taxes	208
Accrued interest	125
Pension and other postretirement benefits	48
Other current liabilities	301
Total current liabilities	1,480
Deferred income taxes	372
Pension and other postretirement benefits	1,731
Other liabilities	424
Long-term debt	6,996
Total liabilities not subject to compromise	11,003
Total liabilities	11,003
Equity (Deficit):
Common stock	2
Additional paid-in capital	4,114
Retained earnings (deficit)	225
Accumulated other comprehensive income (loss), net of tax	44
Total equity (deficit)	4,385
Total liabilities and equity (deficit)	$ 15,388
Predecessor [Member]
Current assets:
Cash and cash equivalents		$ 1,829
Accounts receivable, less allowances of $49 and $130, respectively		553
Contract acquisition costs		97
Prepaid expenses		90
Income taxes and other current assets		85
Total current assets		2,654
Property, plant and equipment, net		12,931
Other intangibles, net		677
Other assets		533
Total assets		16,795
Current liabilities:
Long-term debt due within one year		5,781
Accounts payable		540
Advanced billings		202
Accrued other taxes		204
Accrued interest		47
Pension and other postretirement benefits		48
Other current liabilities		318
Total current liabilities		7,140
Deferred income taxes		343
Pension and other postretirement benefits		2,195
Other liabilities		452
Total liabilities not subject to compromise		10,130
Liabilities subject to compromise		11,565
Total liabilities		21,695
Equity (Deficit):
Common stock		27
Additional paid-in capital		4,817
Retained earnings (deficit)		(8,975)
Accumulated other comprehensive income (loss), net of tax		(755)
Treasury common stock		(14)
Total equity (deficit)		(4,900)
Total liabilities and equity (deficit)		$ 16,795