CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
OPERATING ACTIVITIES
Net income	$ 599	$ 475
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	808	1,150
Deferred income taxes	179	131
Provision for uncollectible accounts	25	27
Net gain on early retirement of debt	0	(8)
Stock-based compensation	23	20
Changes in current assets and liabilities:
Accounts receivable	131	45
Accounts payable	(38)	(93)
Accrued income and other taxes	34	31
Other current assets and liabilities, net	(376)	(272)
Retirement benefits	(38)	(71)
Changes in other noncurrent assets and liabilities, net	(27)	66
Other, net	55	24
Net cash provided by operating activities	1,375	1,525
INVESTING ACTIVITIES
Capital expenditures	(577)	(716)
Proceeds from sale of property, plant and equipment and other assets	6	35
Other, net	2	6
Net cash used in investing activities	(569)	(675)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	0	891
Payments of long-term debt	(1,474)	(1,176)
Net proceeds from (payments on) revolving line of credit	1,000	(150)
Dividends paid	(271)	(294)
Other, net	(31)	(45)
Net cash used in financing activities	(776)	(774)
Net increase in cash, cash equivalents and restricted cash	30	76
Cash, cash equivalents and restricted cash at beginning of period	409	427
Cash, cash equivalents and restricted cash at end of period	439	503
Supplemental cash flow information:
Income taxes paid, net	(10)	(21)
Interest paid (net of capitalized interest of $16 and $13)	(386)	(387)
Cash, cash equivalents and restricted cash:
Cash and cash equivalents	366	486
Cash and cash equivalents included in Assets held for sale	59	0
Restricted cash included in Other current assets	2	2
Restricted cash included in Other, net noncurrent assets	12	15
Total	$ 439	$ 503