CONTINGENCIES AND COMMITMENTS (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Summary of Future Obligations Under Operating Leases

We have summarized our future obligations under operating leases at December 31, 2017 below:

($ in millions)	Land Lease		Corporate Facilities Leases		Other Operating Leases		Total
2018	$	1	$	3	$	13	$	17
2019	1		4		10		15
2020	1		4		8		13
2021	1		3		5		9
2022	1		—		6		7
Thereafter	7		—		28		35
Total minimum lease payments	$	12	$	14	$	70	$	96

Composition of Rental Expense Associated with Operating Leases

The following table details the composition of rent expense associated with operating leases, net of sublease income, for the last three years:

($ in millions)	2017		2016		2015
Minimum rentals	$	9	$	8	$	9
Additional rentals	4		4		4
	$	13	$	12	$	13