Leases - Future Minimum Lease Payments to be Made Under Non-Cancelable Operating Leases Along with Lease and Sublease Minimum Receipts to be Received on Owned and Leased Properties (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Leases [Abstract]
Operating leases, Future Minimum Lease Payments, 2015	$ 59
Operating leases, Future Minimum Lease Payments, 2016	57
Operating leases, Future Minimum Lease Payments, 2017	52
Operating leases, Future Minimum Lease Payments, 2018	45
Operating leases, Future Minimum Lease Payments, 2019	41
Operating leases, Future Minimum Lease Payments, Thereafter	238
Operating leases, Future Minimum Lease Payments, Total	492
Operating leases, Future Minimum Lease Receipts, 2015	5
Operating leases, Future Minimum Lease Receipts, 2016	4
Operating leases, Future Minimum Lease Receipts, 2017	4
Operating leases, Future Minimum Lease Receipts, 2018	3
Operating leases, Future Minimum Lease Receipts, 2019	2
Operating leases, Future Minimum Lease Receipts, Thereafter	7
Operating leases, Future Minimum Lease Receipts, Total	$ 25