Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows provided from (used by) operating activities:
Net income (loss)	$ (5,404)	$ 2
Adjustments to reconcile net income (loss) to net cash provided from (used by) operating activities:
Depreciation and amortization	938	991
Loss (gain) on extinguishment of debt	20	(33)
Pension settlement costs		25
Stock-based compensation expense	7	9
Amortization of deferred financing costs	15	17
Other adjustments	1	(20)
Deferred income taxes	(519)	(9)
Goodwill impairment	5,449
Loss on disposal of Northwest Operations	384
Change in accounts receivable	(1)	37
Change in accounts payable and other liabilities	(14)	(72)
Change in prepaid expenses, income taxes and other assets	(19)	(24)
Net cash provided from operating activities	857	923
Cash flows provided from (used by) investing activities:
Capital expenditures	(580)	(618)
Proceeds on sale of assets	74	11
Other	1	(10)
Net cash used by investing activities	(505)	(617)
Cash flows provided from (used by) financing activities:
Long-term debt payments	(1,999)	(1,714)
Proceeds from long-term debt borrowings	1,650	1,600
Proceeds from revolving debt	450
Repayment of revolving debt	(475)
Financing costs paid	(44)	(39)
Premium paid to retire debt		(17)
Dividends paid on preferred stock		(53)
Finance lease obligation payments	(17)	(17)
Other	(4)	(8)
Net cash used by financing activities	(439)	(248)
Increase (Decrease) in cash, cash equivalents, and restricted cash	(87)	58
Cash, cash equivalents, and restricted cash at January 1,	404	376
Cash, cash equivalents, and restricted cash at June 30,	317	434
Cash paid (received) during the period for:
Interest	712	716
Income tax payments (refunds), net	$ 5	$ 5