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Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 753	$ 673	$ 569	$ 381	$ 2,245	$ 1,342
Reconciliation of net income to net cash provided by operating activities:
Depreciation					883	867
Deferred income taxes					158	78
Gains and losses on properties					(80)	(14)
Loss on asset disposal	0		0		0	385
Impairment of investment					0	99
Changes in assets and liabilities affecting operations:
Accounts receivable					(102)	36
Materials and supplies					(14)	(3)
Other current assets					57	55
Current liabilities other than debt					294	104
Other – net					(128)	(182)
Net cash provided by operating activities					3,313	2,767
Cash flows from investing activities
Property additions					(1,025)	(1,053)
Property sales and other transactions					135	291
Investment purchases					(5)	(6)
Investment sales and other transactions					48	(50)
Net cash used in investing activities					(847)	(818)
Cash flows from financing activities
Dividends					(764)	(722)
Common stock transactions					8	53
Purchase and retirement of common stock					(2,460)	(960)
Proceeds from borrowings					1,676	784
Debt repayments					(576)	(325)
Net cash used in financing activities					(2,116)	(1,170)
Net increase in cash and cash equivalents					350	779
Cash and cash equivalents
At beginning of year		$ 1,115		$ 580	1,115	580	$ 580
At end of period	$ 1,465		$ 1,359		1,465	1,359	$ 1,115
Supplemental disclosures of cash flow information
Interest (net of amounts capitalized)					391	395
Income taxes (net of refunds)					$ 468	$ 118

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