Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents		$ 3,218	$ 2,329
Accounts receivable, net		1,272	1,198
Materials and supplies		825	829
Current portion of deferred income taxes		0	245
Other current assets		235	337
Total current assets		5,550	4,938
Property and equipment, net of accumulated depreciation of $6,130 and $4,845, respectively		61,250	59,510
Goodwill		14,845	14,845
Intangible assets, net		430	468
Other assets		2,047	1,942
Total assets		84,122	81,703
Current liabilities:
Accounts payable and other current liabilities		3,438	3,244
Long-term debt due within one year	[1]	735	389
Total current liabilities		4,173	3,633
Long-term debt	[1]	21,309	21,348
Deferred income taxes		19,866	19,072
Casualty and environmental liabilities		584	609
Intangible liabilities, net		567	667
Pension and retiree health and welfare liability		321	353
Other liabilities		1,130	989
Total liabilities		47,950	46,671
Commitments and contingencies (see Notes 11 and 12)
Equity:
Member's Equity		36,053	34,984
Accumulated other comprehensive income (loss)		119	48
Total equity		36,172	35,032
Total liabilities and equity		$ 84,122	$ 81,703

[1] Amounts represent debt outstanding and weighted average effective interest rates for 2016 and 2015, respectively. Maturities are as of December 31, 2016.