CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
Net income	$ 981	$ 691
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,191	2,322
Deferred income taxes	279	220
Provision for uncollectible accounts	53	90
Net (gain) loss on early retirement of debt	(8)	86
Share-based compensation	62	89
Changes in current assets and liabilities:
Accounts receivable	4	(2)
Accounts payable	(181)	(227)
Accrued income and other taxes	(29)	(3)
Other current assets and liabilities, net	(208)	(203)
Retirement benefits	(131)	(62)
Changes in other noncurrent assets and liabilities, net	120	51
Other, net	31	(4)
Net cash provided by operating activities	3,164	3,048
INVESTING ACTIVITIES
Capital expenditures	(1,362)	(1,983)
Proceeds from sale of property, plant and equipment and other assets	66	84
Other, net	1	1
Net cash used in investing activities	(1,295)	(1,898)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	1,881	2,425
Payments of long-term debt	(2,464)	(3,696)
Net (payments of) proceeds from revolving line of credit	(150)	825
Dividends paid	(568)	(562)
Other, net	(49)	(75)
Net cash used in financing activities	(1,350)	(1,083)
Net increase in cash, cash equivalents and restricted cash	519	67
Cash, cash equivalents and restricted cash at beginning of period	427	1,717
Cash, cash equivalents and restricted cash at end of period	946	1,784
Supplemental cash flow information:
Income taxes paid, net	(73)	(20)
Interest paid (net of capitalized interest of $26 and $43)	(744)	(828)
Cash, cash equivalents and restricted cash:
Cash and cash equivalents	935	1,763
Restricted cash included in Other current assets	2	3
Restricted cash included in Other, net noncurrent assets	9	18
Total	$ 946	$ 1,784