Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows provided from (used by) operating activities:
Net income (loss)	$ (87)	$ 20
Adjustments to reconcile net income (loss) to net cash provided from (used by) operating activities:
Depreciation and amortization	484	505
(Gain) loss on extinguishment of debt	20	(33)
Stock-based compensation expense	3	4
Amortization of deferred financing costs	9	9
Other adjustments		(9)
Deferred income taxes	16	12
Change in accounts receivable	7	9
Change in accounts payable and other liabilities	(157)	(261)
Change in prepaid expenses, income taxes and other assets	(13)	(5)
Net cash provided from operating activities	282	251
Cash flows provided from (used by) investing activities:
Capital expenditures	(305)	(297)
Proceeds on sale of assets	74	10
Other		(2)
Net cash used by investing activities	(231)	(289)
Cash flows provided from (used by) financing activities:
Long-term debt payments	(1,995)	(1,627)
Proceeds from long-term debt borrowings	1,650	1,600
Proceeds from revolving debt	375
Repayment of revolving debt	(275)
Financing costs paid	(30)	(26)
Premium paid to retire debt		(16)
Dividends paid on preferred stock		(53)
Finance lease obligation payments	(8)	(10)
Other	(3)	(5)
Net cash used by financing activities	(286)	(137)
Decrease in cash, cash equivalents, and restricted cash	(235)	(175)
Cash, cash equivalents, and restricted cash at January 1,	404	376
Cash, cash equivalents, and restricted cash at March 31,	169	201
Cash paid (received) during the period for:
Interest	525	593
Income tax payments (refunds), net