Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment—Property and equipment is stated at cost.  Depreciation is computed by the straight-line method over estimated useful lives as follows:

Buildings and building improvements	10 to 40 years
Leasehold Improvements	Shorter of lease term or useful life
Equipment and other (including capital leases)	3 to 20 years

At December 31,	2017		2016
Land	$	193	$	195
Buildings	769		733
Capital leases (a)	162		164
Equipment and other	1,927		1,843
	3,051		2,935
Less accumulated depreciation and amortization	1,771		1,694
Net property and equipment	$	1,280	$	1,241

(a) Accumulated amortization of capital leases was $112 million and $98 million at December 31, 2017 and 2016, respectively.

Year Ended December 31,	2017		2016		2015
Depreciation expense, including capitalized lease amortization (a)	$	203	$	205	$	212

(a) Amortization expense related to capital leases was $16 million, $17 million and $16 million in 2017, 2016, and 2015, respectively.