CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
OPERATING ACTIVITIES
Net income (loss)	$ 1,057	$ (5,492)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	3,515	3,619
Impairment of goodwill	0	6,516
Deferred income taxes	315	350
Provision for uncollectible accounts	137	116
Net loss (gain) on early retirement of debt	78	(70)
Share-based compensation	120	114
Changes in current assets and liabilities:
Accounts receivable	(34)	(7)
Accounts payable	(325)	(265)
Accrued income and other taxes	90	131
Other current assets and liabilities, net	(408)	(323)
Retirement benefits	(96)	(24)
Changes in other noncurrent assets and liabilities, net	287	72
Other, net	106	34
Net cash provided by operating activities	4,842	4,771
INVESTING ACTIVITIES
Capital expenditures	(2,971)	(2,688)
Proceeds from sale of property, plant and equipment and other assets	119	54
Other, net	12	(37)
Net cash used in investing activities	(2,840)	(2,671)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	3,257	988
Payments of long-term debt	(6,334)	(1,459)
Net proceeds from revolving line of credit	825	150
Dividends paid	(837)	(829)
Other, net	(83)	(37)
Net cash used in financing activities	(3,172)	(1,187)
Net (decrease) increase in cash, cash equivalents and restricted cash	(1,170)	913
Cash, cash equivalents and restricted cash at beginning of period	1,717	518
Cash, cash equivalents and restricted cash at end of period	547	1,431
Supplemental cash flow information:
Income taxes refunded, net	51	54
Interest paid (net of capitalized interest of $60 and $42)	(1,254)	(1,506)
Total	$ 547	$ 1,431