Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows provided from (used by) operating activities:
Net loss	$ (5,749)	$ (424)
Adjustments to reconcile net loss to net cash provided from (used by) operating activities:
Depreciation and amortization	1,360	1,462
Loss (gain) on extinguishment of debt	20	(31)
Pension settlement costs		34
Stock-based compensation expense	10	14
Amortization of deferred financing costs	23	26
Other adjustments	2	(24)
Deferred income taxes	(541)	(12)
Goodwill impairment	5,725	400
Loss on disposal of Northwest Operations	414
Change in accounts receivable	17	43
Change in accounts payable and other liabilities	(153)	(239)
Change in prepaid expenses, income taxes and other assets	(25)	(40)
Net cash provided from operating activities	1,103	1,209
Cash flows provided from (used by) investing activities:
Capital expenditures	(898)	(947)
Proceeds on sale of assets	76	11
Other	2	4
Net cash used by investing activities	(820)	(932)
Cash flows provided from (used by) financing activities:
Long-term debt payments	(2,003)	(1,997)
Proceeds from long-term debt borrowings	1,650	1,840
Proceeds from revolving debt	949
Repayment of revolving debt	(475)
Financing costs paid	(44)	(43)
Premium paid to retire debt		(17)
Dividends paid on preferred stock		(107)
Finance lease obligation payments	(26)	(30)
Other	(5)	(11)
Net cash provided from (used by) financing activities	46	(365)
Increase (Decrease) in cash, cash equivalents, and restricted cash	329	(88)
Cash, cash equivalents, and restricted cash at January 1,	404	376
Cash, cash equivalents, and restricted cash at September 30,	733	288
Cash paid during the period for:
Interest	1,208	1,266
Income tax payments, net	$ 5	$ 5