Goodwill and Identifiable Intangible Assets - Identifiable Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	17 years
Gross Carrying Amount	$ 651	$ 598
Accumulated Amortization	337	290
Net Carrying Amount	314	308
Customer contractual relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	19 years
Gross Carrying Amount	460	422
Accumulated Amortization	225	192
Net Carrying Amount	235	230
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	11 years
Gross Carrying Amount	164	149
Accumulated Amortization	98	87
Net Carrying Amount	66	62
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	17 years
Gross Carrying Amount	27	27
Accumulated Amortization	14	11
Net Carrying Amount	$ 13	$ 16