Properties (Tables)

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]


			Accumulated		Net Book		Depreciation
December 31, 2022	Cost		Depreciation		Value		Rate (1)
	($ in millions)

Land	$	2,405	$	—	$	2,405	—

Roadway:
Rail and other track material	7,589		(1,971)		5,618		2.42	%
Ties	5,981		(1,696)		4,285		3.49	%
Ballast	3,126		(873)		2,253		2.84	%
Construction in process	431		—		431		—
Other roadway	14,270		(3,948)		10,322		2.69	%
Total roadway	31,397		(8,488)		22,909

Equipment:
Locomotives	5,878		(2,060)		3,818		3.66	%
Freight cars	2,701		(1,033)		1,668		2.51	%
Computers and software	926		(476)		450		9.10	%
Construction in process	206		—		206		—
Other equipment	1,145		(463)		682		4.51	%
Total equipment	10,856		(4,032)		6,824

Other property	90		(72)		18		2.26	%

Total properties	$	44,748	$	(12,592)	$	32,156


			Accumulated		Net Book		Depreciation
December 31, 2021	Cost		Depreciation		Value		Rate (1)
	($ in millions)

Land	$	2,453	$	—	$	2,453	—

Roadway:
Rail and other track material	7,330		(1,907)		5,423		2.40	%
Ties	5,779		(1,642)		4,137		3.44	%
Ballast	3,041		(818)		2,223		2.79	%
Construction in process	339		—		339		—
Other roadway	14,111		(3,733)		10,378		2.69	%
Total roadway	30,600		(8,100)		22,500

Equipment:
Locomotives	5,695		(1,994)		3,701		3.87	%
Freight cars	2,701		(1,009)		1,692		2.59	%
Computers and software	893		(438)		455		10.34	%
Construction in process	164		—		164		—
Other equipment	1,088		(420)		668		4.63	%
Total equipment	10,541		(3,861)		6,680

Other property	90		(70)		20		2.25	%

Total properties	$	43,684	$	(12,031)	$	31,653

(1)Composite annual depreciation rate for the underlying assets, excluding the effects of the amortization of any deficiency (or excess) that resulted from our depreciation studies.