Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents		$ 2,329	$ 2,384
Accounts receivable, net		1,198	1,386
Materials and supplies		829	795
Current portion of deferred income taxes		245	355
Other current assets		337	232
Total current assets		4,938	5,152
Property and equipment, net of accumulated depreciation of $4,845 and $3,550, respectively		59,510	55,806
Goodwill		14,845	14,819
Intangible assets, net		468	512
Other assets		1,942	1,838
Total assets		81,703	78,127
Current liabilities:
Accounts payable and other current liabilities		3,244	3,435
Long-term debt due within one year	[1]	389	366
Total current liabilities		3,633	3,801
Long-term debt	[1]	21,348	18,838
Deferred income taxes		19,072	18,001
Intangible liabilities, net		667	782
Casualty and environmental liabilities		609	639
Pension and retiree health and welfare liability		353	385
Other liabilities		989	947
Total liabilities		$ 46,671	$ 43,393
Commitments and contingencies (see Notes 11 and 12)
Equity:
Member's Equity		$ 34,984	$ 34,736
Accumulated other comprehensive income (loss)		48	(2)
Total equity		35,032	34,734
Total liabilities and equity		$ 81,703	$ 78,127

[1] Amounts represent debt outstanding and weighted average effective interest rates for 2015 and 2014, respectively. Maturities are as of December 31, 2015.