Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net income	$ 1,190	$ 1,253
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	615	591
Deferred income taxes	87	115
Long-term casualty and environmental liabilities, net	(15)	1
Other, net	(122)	(254)
Changes in current assets and liabilities:
Accounts receivable, net	2	95
Materials and supplies	54	(20)
Other current assets	(10)	(149)
Accounts payable and other current liabilities	(52)	277
Net cash provided by operating activities	1,749	1,909
Investing Activities
Capital expenditures excluding equipment	(650)	(569)
Acquisition of equipment	(37)	(50)
Purchases of investments and investments in time deposits	0	(5)
Proceeds from sales of investments and maturities of time deposits	13	3
Other, net	(56)	(71)
Net cash used for investing activities	(730)	(692)
Financing Activities
Payments on long-term debt and finance leases	(51)	(11)
Cash distributions	(1,100)	(1,200)
Net cash used for financing activities	(1,151)	(1,211)
(Decrease) increase in cash and cash equivalents	(132)	6
Cash and cash equivalents:
Beginning of period	1,984	1,985
End of period	1,852	1,991
Supplemental Cash Flow Information
Interest paid, net of amounts capitalized	305	283
Capital investments accrued but not yet paid	145	116
Income taxes paid, net of refunds	3	13
Non-cash asset financing	$ 6	$ 4