Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Rental Expense for Property and Equipment Under Operating Lease Agreements

Rental expense for property and equipment under all operating lease agreements is as follows:



(in millions)	Years ended December 31,
	2015			2014			2013
Gross rental expense	$	182		$	199		$	202
Less: sublease revenue	(14		)	(16		)	(29		)
Less: Rock-McGraw rent credit	(4		)	(23		)	(20		)
Net rental expense	$	164		$	160		$	153

Future Minimum Rental Commitments

Cash amounts for future minimum rental commitments, including rent payments on the sale-leaseback, under existing non-cancelable leases with a remaining term of more than one year, along with minimum sublease rental income to be received under non-cancelable subleases are shown in the following table.



(in millions)	Rent commitment		Sublease income			Net rent
2016	$	136	$	(14	)	$	122
2017	120		(13		)	107
2018	109		(13		)	96
2019	101		(13		)	88
2020	49		(2		)	47
2021 and beyond	162		—			162
Total	$	677	$	(55	)	$	622

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

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