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Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 673	$ 381
Reconciliation of net income to net cash provided by operating activities:
Depreciation	292	292
Deferred income taxes	52	11
Gains and losses on properties	(8)	(8)
Loss on asset disposal	0	385
Changes in assets and liabilities affecting operations:
Accounts receivable	(95)	32
Materials and supplies	(20)	(21)
Other current assets	9	(33)
Current liabilities other than debt	158	(40)
Other – net	(46)	(44)
Net cash provided by operating activities	1,015	955
Cash flows from investing activities
Property additions	(265)	(366)
Property sales and other transactions	37	158
Investment sales and other transactions	26	(25)
Net cash used in investing activities	(202)	(233)
Cash flows from financing activities
Dividends	(249)	(242)
Common stock transactions	(6)	14
Purchase and retirement of common stock	(591)	(466)
Debt repayments	(84)	0
Net cash used in financing activities	(930)	(694)
Net increase (decrease) in cash and cash equivalents	(117)	28
Cash and cash equivalents
At beginning of year	1,115	580	$ 580
At end of period	998	608	$ 1,115
Supplemental disclosures of cash flow information
Interest (net of amounts capitalized)	110	121
Income taxes (net of refunds)	$ 27	$ 16

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