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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net income	$ 703	$ 673
Reconciliation of net income to net cash provided by operating activities:
Depreciation	302	292
Deferred income taxes	48	52
Gains and losses on properties	(6)	(8)
Changes in assets and liabilities affecting operations:
Accounts receivable	(94)	(95)
Materials and supplies	(46)	(20)
Other current assets	21	9
Current liabilities other than debt	83	158
Other – net	(17)	(46)
Net cash provided by operating activities	994	1,015
Cash flows from investing activities
Property additions	(389)	(265)
Property sales and other transactions	36	37
Investment purchases	(1)	0
Investment sales and other transactions	19	26
Net cash used in investing activities	(335)	(202)
Cash flows from financing activities
Dividends	(297)	(249)
Common stock transactions	(18)	(6)
Purchase and retirement of common stock	(600)	(591)
Proceeds from borrowings	989	0
Debt repayments	(1)	(84)
Net cash provided by (used in) financing activities	73	(930)
Net increase (decrease) in cash and cash equivalents	732	(117)
Cash and cash equivalents
At beginning of year	839	1,115
At end of period	1,571	998
Supplemental disclosures of cash flow information
Interest (net of amounts capitalized)	114	110
Income taxes (net of refunds)	$ 9	$ 27

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