Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents		$ 1,975	$ 3,218
Accounts receivable, net		1,448	1,272
Materials and supplies		803	825
Other current assets		408	235
Total current assets		4,634	5,550
Property and equipment, net of accumulated depreciation of $8,627 and $6,130, respectively		62,313	61,250
Goodwill		14,845	14,845
Intangible assets, net		394	430
Other assets		2,337	2,047
Total assets		84,523	84,122
Current liabilities:
Accounts payable and other current liabilities		3,169	3,438
Long-term debt due within one year	[1]	740	735
Total current liabilities		3,909	4,173
Long-term debt	[1]	21,759	21,309
Deferred income taxes		13,452	19,866
Casualty and environmental liabilities		499	584
Intangible liabilities, net		471	567
Pension and retiree health and welfare liability		310	321
Other liabilities		1,114	1,130
Total liabilities		41,514	47,950
Commitments and contingencies (see Notes 11 and 12)
Equity:
Member's Equity		42,778	36,053
Accumulated other comprehensive income (loss)		231	119
Total equity		43,009	36,172
Total liabilities and equity		$ 84,523	$ 84,122

[1] Amounts represent debt outstanding and weighted average effective interest rates for 2017 and 2016, respectively. Maturities are as of December 31, 2017.