Rental Expense and Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2015

Rental Expense and Lease Commitments

Lease Commitments

($ in millions)
			2016		2017		2018		2019		2020		Beyond 2020
Operating lease commitments
	Gross minimum rental commitments
		(including vacant space below)	$	1,347	$	1,231	$	1,107	$	985	$	776	$	988
	Vacant space		$	14	$	4	$	1	$	—	$	—	$	—
	Sublease income commitments		$	11	$	7	$	5	$	4	$	1	$	1
Capital lease commitments			$	7	$	2	$	2	$	2	$	1	$	—