Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities
Net income	$ 1,630	$ 1,630
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	572	555
Deferred and other income taxes	52	60
Other operating activities, net	(117)	(43)
Changes in current assets and liabilities:
Accounts receivable, net	(59)	(236)
Materials and supplies	13	(105)
Other current assets	(73)	(43)
Accounts payable and other current liabilities	(437)	63
Income and other taxes	259	355
Cash provided by operating activities	1,840	2,236
Investing Activities
Capital investments	(772)	(848)
Maturities of short-term investments (Note 11)	46	0
Proceeds from asset sales	12	32
Other investing activities, net	(91)	(20)
Cash used in investing activities	(805)	(836)
Financing Activities
Debt issued (Note 12)	1,199	3,490
Dividends paid	(795)	(743)
Debt repaid	(647)	(866)
Share repurchase programs (Note 14)	(575)	(2,743)
Net issued/(paid) commercial paper (Note 12)	(102)	(100)
Other financing activities, net	(7)	(51)
Cash used in financing activities	(927)	(1,453)
Net change in cash, cash equivalents, and restricted cash	108	(53)
Cash, cash equivalents, and restricted cash at beginning of year	987	983
Cash, cash equivalents, and restricted cash at end of period	1,095	930
Non-cash investing and financing activities:
Capital investments accrued but not yet paid	156	157
Common shares repurchased but not yet paid	15	10
Cash (paid for)/received from:
Income taxes, net of refunds	(35)	(7)
Interest, net of amounts capitalized	(454)	(382)
Cash and cash equivalents	1,079	909
Total cash, cash equivalents and restricted cash equivalents per above	1,095	930
Other Current Assets [Member]
Cash (paid for)/received from:
Restricted cash equivalents	7	17
Other Noncurrent Assets [Member]
Cash (paid for)/received from:
Restricted cash equivalents	9	4
Accelerated Share Repurchase Agreement [Member]
Financing Activities
Share repurchase programs (Note 14)	$ 0	$ (440)