CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING ACTIVITIES
Net income (loss)	$ 314	$ (6,165)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,160	1,188
Impairment of goodwill and other assets	2	6,508
Deferred income taxes	105	126
Provision for uncollectible accounts	35	46
Net loss (gain) on early retirement of debt	79	(9)
Share-based compensation	69	33
Changes in current assets and liabilities:
Accounts receivable	60	5
Accounts payable	(115)	(239)
Accrued income and other taxes	(16)	45
Other current assets and liabilities, net	(366)	(336)
Retirement benefits	(25)	(14)
Changes in other noncurrent assets and liabilities, net	(14)	(4)
Other, net	11	(2)
Net cash provided by operating activities	1,299	1,182
INVESTING ACTIVITIES
Capital expenditures	(974)	(931)
Proceeds from sale of property, plant and equipment and other assets	35	25
Net cash used in investing activities	(939)	(906)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	1,237	0
Payments of long-term debt	(2,488)	(153)
Net proceeds from revolving line of credit	1,125	145
Dividends paid	(291)	(285)
Other, net	(69)	(27)
Net cash used in financing activities	(486)	(320)
Net decrease in cash, cash equivalents and restricted cash	(126)	(44)
Cash, cash equivalents and restricted cash at beginning of period	1,717	518
Cash, cash equivalents and restricted cash at end of period	1,591	474
Supplemental cash flow information:
Income taxes paid, net	(6)	(7)
Interest paid (net of capitalized interest of $23 and $15)	(383)	(480)
Total	$ 1,591	$ 474