CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
OPERATING ACTIVITIES
Net (loss) income	$ (5,794)	$ 407
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	2,384	2,573
Impairment of goodwill and other assets	6,506	28
Deferred income taxes	244	400
Provision for uncollectible accounts	85	83
Net (gain) loss on early retirement of debt	(66)	1
Share-based compensation	76	95
Changes in current assets and liabilities:
Accounts receivable	(132)	35
Accounts payable	(266)	(173)
Accrued income and other taxes	20	(147)
Other current assets and liabilities, net	(233)	(276)
Retirement benefits	(8)	(195)
Changes in other noncurrent assets and liabilities, net	67	400
Other, net	0	18
Net cash provided by operating activities	2,883	3,249
INVESTING ACTIVITIES
Capital expenditures	(1,731)	(1,576)
Proceeds from sale of property, plant and equipment and other assets	26	125
Other, net	(12)	(61)
Net cash used in investing activities	(1,717)	(1,512)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	0	130
Payments of long-term debt	(760)	(123)
Net proceeds (payments) on revolving line of credit	100	(405)
Dividends paid	(554)	(1,156)
Other, net	(30)	(38)
Net cash used in financing activities	(1,244)	(1,592)
Net (decrease) increase in cash, cash equivalents and restricted cash	(78)	145
Cash, cash equivalents and restricted cash at beginning of period	518	587
Cash, cash equivalents and restricted cash at end of period	440	732
Supplemental cash flow information:
Income taxes (paid) refunded, net	(22)	292
Interest paid (net of capitalized interest of $32 and $28)	(1,050)	(1,061)
Cash and cash equivalents	410	700
Restricted cash - current	3	5
Restricted cash - noncurrent	$ 27	$ 27