Leases (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Future Minimum Rent Payments Under Non-Cancelable Leases

The future minimum rent payments under non-cancelable leases, due in each of the next five years and thereafter as of December 31, 2017, were as follows:

($ in millions)	Operating Leases
Year
2018	$	14
2019		12
2020		11
2021		10
2022		8
Thereafter		23
Total minimum rent payments	$	78

Schedule of Rent Expense

Rent expense for all operating leases was as follows:

	Year Ended December 31,
($ in millions)	2017		2016		2015
Minimum rentals	$	17	$	16	$	12
Contingent rentals		3		1		5
	$	20	$	17	$	17