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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income	$ 6,523	$ 5,349	$ 5,919
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	2,208	2,210	2,216
Deferred and other income taxes	154	340	566
Gain on non-operating asset dispositions	(98)	(115)	(20)
Other operating activities, net	42	490	98
Changes in current assets and liabilities:
Accounts receivable, net	(217)	90	160
Materials and supplies	17	113	(9)
Other current assets	31	(34)	87
Accounts payable and other current liabilities	184	(73)	(179)
Income and other taxes	188	170	(229)
Cash provided by operating activities	9,032	8,540	8,609
Investing Activities
Capital investments	(2,936)	(2,927)	(3,453)
Proceeds from asset sales	178	149	74
Maturities of short-term investments (Note 13)	94	141	130
Purchases of short-term investments (Note 13)	(70)	(136)	(115)
Other investing activities, net	25	97	(71)
Cash used in investing activities	(2,709)	(2,676)	(3,435)
Financing Activities
Share repurchase programs (Note 18)	(7,291)	(3,705)	(5,804)
Debt issued (Note 14)	4,201	4,004	3,986
Dividends paid	(2,800)	(2,626)	(2,598)
Debt repaid	(1,299)	(2,053)	(817)
Net issued/(paid) commercial paper (Note 14)	325	(127)	(6)
Debt exchange (Note 14)	(270)	(328)	(387)
Other financing activities, net	(24)	(67)	(20)
Cash used in financing activities	(7,158)	(4,902)	(5,646)
Net change in cash, cash equivalents, and restricted cash	(835)	962	(472)
Cash, cash equivalents, and restricted cash at beginning of year	1,818	856	1,328
Cash, cash equivalents, and restricted cash at end of year	983	1,818	856
Non-cash investing and financing activities:
Term loan renewals (Note 14)	100	250	250
Capital investments accrued but not yet paid	263	166	224
Locomotives sold for material credits	0	0	18
Cash paid during the year for:
Income taxes, net of refunds	(1,658)	(1,214)	(1,382)
Interest, net of amounts capitalized	$ (1,087)	$ (1,050)	$ (1,033)

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