Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows provided from (used by) operating activities:
Net income (loss)	$ 20	$ (75)
Adjustments to reconcile net income (loss) to net cash provided from (used by) operating activities:
Depreciation and amortization	505	579
Gain on extinguishment of debt	(33)
Pension settlement costs		43
Stock-based compensation expense	4	3
Amortization of deferred financing costs	9	9
Other adjustments	(9)
Deferred income taxes	12	(41)
Change in accounts receivable	9	105
Change in accounts payable and other liabilities	(261)	(312)
Change in prepaid expenses, income taxes and other current assets	(5)	(11)
Net cash provided from operating activities	251	300
Cash flows provided from (used by) investing activities:
Capital expenditures - Business operations	(297)	(315)
Capital expenditures - Integration activities		(1)
Proceeds on sale of assets	10	70
Other	(2)	3
Net cash used by investing activities	(289)	(243)
Cash flows provided from (used by) financing activities:
Proceeds from long-term debt borrowings	1,600
Long-term debt payments	(1,627)	(38)
Financing costs paid	(26)	(6)
Premium paid to retire debt	(16)
Dividends paid on common stock		(124)
Dividends paid on preferred stock	(53)	(54)
Capital lease obligation payments	(10)	(10)
Other	(5)	(6)
Net cash used by financing activities	(137)	(238)
Decrease in cash, cash equivalents, and restricted cash	(175)	(181)
Cash, cash equivalents, and restricted cash at January 1,	376	522
Cash, cash equivalents, and restricted cash at March 31,	201	341
Cash paid (received) during the period for:
Interest	$ 593	577
Income tax refunds, net		$ (3)