Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows provided from (used by) operating activities:
Net loss	$ (352)	$ (5,749)
Adjustments to reconcile net loss to net cash provided from (used by) operating activities:
Depreciation and amortization	1,204	1,360
Loss on extinguishment of debt		20
Pension settlement costs	159
Stock-based compensation expense	3	10
Amortization of deferred financing costs	13	23
Non-cash reorganization items, net	85
Other adjustments	3	2
Deferred income taxes	(100)	(541)
Goodwill impairment		5,725
Loss on disposal of Northwest Operations	160	414
Change in accounts receivable	63	17
Change in accounts payable and other liabilities	334	(153)
Change in prepaid expenses, income taxes and other assets	(80)	(25)
Net cash provided from operating activities	1,492	1,103
Cash flows provided from (used by) investing activities:
Capital expenditures	(825)	(898)
Proceeds from sale of Northwest Operations	1,131
Proceeds on sale of assets	7	76
Other	2	2
Net cash provided from (used by) investing activities	315	(820)
Cash flows provided from (used by) financing activities:
Long-term debt principal payments	(5)	(2,003)
Proceeds from long-term debt borrowings		1,650
Proceeds from revolving debt		949
Repayment of revolving debt	(749)	(475)
Financing costs paid	(19)	(44)
Finance lease obligation payments	(18)	(26)
Other		(5)
Net cash provided from (used by) financing activities	(791)	46
Increase (Decrease) in cash, cash equivalents, and restricted cash	1,016	329
Cash, cash equivalents, and restricted cash at January 1,	809	404
Cash, cash equivalents, and restricted cash at September 30,	1,825	733
Cash paid during the period for:
Interest	548	1,208
Income tax payments, net	6	$ 5
Reorganization items, net	$ 134