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Future Minimum Operating Lease Payments and Committed Subleases Under Non-Cancelable Leases (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Commitments and Contingencies [Line Items]
Operating lease obligations - Total Amounts	$ 72
Operating lease obligations - 2013	21
Operating lease obligations - 2014	18
Operating lease obligations - 2015	16
Operating lease obligations - 2016	10
Operating lease obligations - 2017	7
Sublease rentals - Total Amounts	(14)
Sublease rentals - 2013	(3)
Sublease rentals - 2014	(3)
Sublease rentals - 2015	(3)
Sublease rentals - 2016	(3)
Sublease rentals - 2017	(2)
Total committed operating leases less sublease rentals - Total Amounts	58
Total committed operating leases less sublease rentals - 2013	18
Total committed operating leases less sublease rentals - 2014	15
Total committed operating leases less sublease rentals - 2015	13
Total committed operating leases less sublease rentals - 2016	7
Total committed operating leases less sublease rentals - 2017	$ 5

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