Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income	$ 5,919	$ 5,966	$ 10,712
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	2,216	2,191	2,105
Deferred and other income taxes	566	338	(5,067)
Net gain on non-operating asset dispositions	(20)	(30)	(111)
Other operating activities, net	98	347	(282)
Changes in current assets and liabilities:
Accounts receivable, net	160	(262)	(235)
Materials and supplies	(9)	7	(32)
Other current assets	87	(24)	9
Accounts payable and other current liabilities	(179)	(125)	182
Income and other taxes	(229)	278	(51)
Cash provided by operating activities	8,609	8,686	7,230
Investing Activities
Capital investments	(3,453)	(3,437)	(3,238)
Maturities of short-term investments (Note 14)	130	90	90
Purchases of short-term investments (Note 14)	(115)	(90)	(120)
Proceeds from asset sales	74	63	168
Other investing activities, net	(71)	(37)	14
Cash used in investing activities	(3,435)	(3,411)	(3,086)
Financing Activities
Common share repurchases (Note 19)	(5,804)	(8,225)	(4,013)
Debt issued	3,986	6,892	2,735
Dividends paid	(2,598)	(2,299)	(1,982)
Debt repaid	(817)	(1,736)	(840)
Debt exchange	(387)
Net issuance of commercial paper	(6)	194
Other financing activities, net	(20)	(48)	(46)
Cash used in financing activities	(5,646)	(5,222)	(4,146)
Net change in cash, cash equivalents and restricted cash	(472)	53	(2)
Cash, cash equivalents, and restricted cash at beginning of year	1,328	1,275	1,277
Cash, cash equivalents, and restricted cash at end of year	856	1,328	1,275
Non-cash investing and financing activities:
Term loan renewals	250	250
Capital investments accrued but not yet paid	224	205	366
Locomotives sold for material credits	18
Finance lease financings		12	19
Cash paid during the year for:
Income taxes, net of refunds	(1,382)	(1,205)	(2,112)
Interest, net of amounts capitalized	$ (1,033)	$ (728)	$ (666)