CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING ACTIVITIES
Net (loss) income	$ (6,165)	$ 115
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	1,188	1,283
Impairment of goodwill and other assets	6,508	27
Deferred income taxes	126	123
Provision for uncollectible accounts	46	47
Net (gain) loss on early retirement of debt	(9)	1
Share-based compensation	33	41
Changes in current assets and liabilities:
Accounts receivable	5	117
Accounts payable	(239)	(14)
Accrued income and other taxes	45	20
Other current assets and liabilities, net	(336)	(262)
Retirement benefits	(14)	(49)
Changes in other noncurrent assets and liabilities, net	(4)	145
Other, net	(2)	73
Net cash provided by operating activities	1,182	1,667
INVESTING ACTIVITIES
Capital expenditures	(931)	(805)
Proceeds from sale of property, plant and equipment	25	3
Other, net	0	34
Net cash used in investing activities	(906)	(768)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	0	130
Payments of long-term debt	(153)	(68)
Net proceeds (payments) on revolving line of credit	145	(405)
Dividends paid	(285)	(580)
Other, net	(27)	(26)
Net cash used in financing activities	(320)	(949)
Net decrease in cash, cash equivalents and restricted cash	(44)	(50)
Cash, cash equivalents and restricted cash at beginning of period	518	587
Cash, cash equivalents and restricted cash at end of period	474	537
Supplemental cash flow information:
Income taxes paid, net	(7)	(2)
Interest paid (net of capitalized interest of $15 and $15)	$ (480)	$ (491)