Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows provided from (used by) operating activities:
Net loss	$ (186)	$ (87)
Adjustments to reconcile net loss to net cash provided from (used by) operating activities:
Depreciation and amortization	415	484
Loss on extinguishment of debt		20
Pension settlement costs	103
Stock-based compensation expense	1	3
Amortization of deferred financing costs	8	9
Other adjustments	1
Deferred income taxes	(30)	16
Loss on disposal of Northwest Operations	24
Change in accounts receivable	29	7
Change in accounts payable and other liabilities	110	(157)
Change in prepaid expenses, income taxes and other assets	2	(13)
Net cash provided from operating activities	477	282
Cash flows provided from (used by) investing activities:
Capital expenditures	(286)	(305)
Proceeds on sale of assets	2	74
Other	2
Net cash used by investing activities	(282)	(231)
Cash flows provided from (used by) financing activities:
Long-term debt principle payments	(5)	(1,995)
Proceeds from long-term debt borrowings		1,650
Proceeds from revolving debt		375
Repayment of revolving debt		(275)
Financing costs paid		(30)
Finance lease obligation payments	(8)	(8)
Other		(3)
Net cash used by financing activities	(13)	(286)
Increase (Decrease) in cash, cash equivalents, and restricted cash	182	(235)
Cash, cash equivalents, and restricted cash at January 1,	809	404
Cash, cash equivalents, and restricted cash at March 31,	991	169
Cash paid during the period for:
Interest	163	$ 525
Income tax payments, net	$ 1