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Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net income	$ 6,998	$ 6,523	$ 5,349
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	2,246	2,208	2,210
Deferred and other income taxes	262	154	340
Gain on non-operating asset dispositions	(176)	(98)	(115)
Other operating activities, net	24	42	490
Changes in current assets and liabilities:
Accounts receivable, net	(169)	(217)	90
Materials and supplies	(120)	17	113
Other current assets	5	31	(34)
Accounts payable and other current liabilities	565	184	(73)
Income and other taxes	(273)	188	170
Cash provided by operating activities	9,362	9,032	8,540
Investing Activities
Capital investments	(3,620)	(2,936)	(2,927)
Proceeds from asset sales	194	178	149
Maturities of short-term investments (Note 13)	46	94	141
Purchases of short-term investments (Note 13)	(46)	(70)	(136)
Other investing activities, net	(45)	25	97
Cash used in investing activities	(3,471)	(2,709)	(2,676)
Financing Activities
Share repurchase programs (Note 18)	(6,282)	(7,291)	(3,705)
Debt issued (Note 14)	6,080	4,201	4,004
Dividends paid	(3,159)	(2,800)	(2,626)
Debt repaid	(2,291)	(1,299)	(2,053)
Net issued/(paid) commercial paper (Note 14)	(205)	325	(127)
Debt exchange (Note 14)	0	(270)	(328)
Other financing activities, net	(30)	(24)	(67)
Cash used in financing activities	(5,887)	(7,158)	(4,902)
Net change in cash, cash equivalents, and restricted cash	4	(835)	962
Cash, cash equivalents, and restricted cash at beginning of year	983	1,818	856
Cash, cash equivalents, and restricted cash at end of year	987	983	1,818
Non-cash investing and financing activities:
Capital investments accrued but not yet paid	152	263	166
Term loan renewals (Note 14)	0	100	250
Cash paid during the year for:
Income taxes, net of refunds	(2,060)	(1,658)	(1,214)
Interest, net of amounts capitalized	$ (1,156)	$ (1,087)	$ (1,050)

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