Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows provided from (used by) operating activities:
Net income (loss)	$ 2	$ (737)
Adjustments to reconcile net income (loss) to net cash provided from (used by) operating activities:
Depreciation and amortization	991	1,131
(Gain) loss on extinguishment of debt	(33)	90
Pension settlement costs	25	62
Stock-based compensation expense	9	6
Amortization of deferred financing costs	17	17
Other adjustments	(20)	(4)
Deferred income taxes	(9)	(254)
Goodwill impairment		670
Change in accounts receivable	37	151
Change in accounts payable and other liabilities	(72)	(253)
Change in prepaid expenses, income taxes and other current assets	(24)	(50)
Net cash provided from operating activities	923	829
Cash flows provided from (used by) investing activities:
Capital expenditures - Business operations	(618)	(578)
Capital expenditures - Integration activities		(5)
Proceeds on sale of assets	11	94
Other	(10)	5
Net cash used by investing activities	(617)	(484)
Cash flows provided from (used by) financing activities:
Proceeds from long-term debt borrowings	1,600	1,500
Long-term debt payments	(1,714)	(1,576)
Financing costs paid	(39)	(15)
Premium paid to retire debt	(17)	(80)
Dividends paid on common stock		(172)
Dividends paid on preferred stock	(53)	(107)
Capital lease obligation payments	(17)	(25)
Other	(8)	(5)
Net cash used by financing activities	(248)	(480)
Increase (decrease) in cash, cash equivalents, and restricted cash	58	(135)
Cash, cash equivalents, and restricted cash at January 1,	376	522
Cash, cash equivalents, and restricted cash at June 30,	434	387
Cash paid (received) during the period for:
Interest	716	797
Income tax payments (refunds), net	$ 5	$ (3)