Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows provided from (used by) operating activities:
Net loss	$ (367)	$ (5,404)
Adjustments to reconcile net loss to net cash provided from (used by) operating activities:
Depreciation and amortization	812	938
Loss on extinguishment of debt		20
Pension settlement costs	159
Stock-based compensation expense	2	7
Amortization of deferred financing costs	11	15
Non-cash reorganization items, net	85
Other adjustments	2	1
Deferred income taxes	(92)	(519)
Goodwill impairment		5,449
Loss on disposal of Northwest Operations	160	384
Change in accounts receivable	23	(1)
Change in accounts payable and other liabilities	278	(14)
Change in prepaid expenses, income taxes and other assets	(123)	(19)
Net cash provided from operating activities	950	857
Cash flows provided from (used by) investing activities:
Capital expenditures	(511)	(580)
Proceeds from sale of Northwest Operations	1,131
Proceeds on sale of assets	5	74
Other	3	1
Net cash provided from (used by) investing activities	628	(505)
Cash flows provided from (used by) financing activities:
Long-term debt principal payments	(5)	(1,999)
Proceeds from long-term debt borrowings		1,650
Proceeds from revolving debt		450
Repayment of revolving debt		(475)
Financing costs paid	(19)	(44)
Finance lease obligation payments	(13)	(17)
Other		(4)
Net cash used by financing activities	(37)	(439)
Increase (Decrease) in cash, cash equivalents, and restricted cash	1,541	(87)
Cash, cash equivalents, and restricted cash at January 1,	809	404
Cash, cash equivalents, and restricted cash at June 30,	2,350	317
Cash paid during the period for:
Interest	427	712
Income tax payments, net	1	$ 5
Reorganization items, net	$ 34