Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Finite And Indefinite Intangible Assets [Line Items]
Amortized intangibles, Gross Amounts	$ 4,835	$ 4,452
Amortized intangibles, Accumulated Amortization	(1,901)	(1,818)
Trade names and trademarks
Finite And Indefinite Intangible Assets [Line Items]
Indefinite-lived intangibles, Gross Amounts	1,921	1,921
Amortized intangibles, Gross Amounts	161	128
Amortized intangibles, Accumulated Amortization	(52)	(46)
Customer-related intangibles
Finite And Indefinite Intangible Assets [Line Items]
Amortized intangibles, Gross Amounts	2,940	2,882
Amortized intangibles, Accumulated Amortization	(865)	(886)
Covenants-not-to-compete
Finite And Indefinite Intangible Assets [Line Items]
Amortized intangibles, Gross Amounts	35	36
Amortized intangibles, Accumulated Amortization	(16)	(25)
Computer software
Finite And Indefinite Intangible Assets [Line Items]
Amortized intangibles, Gross Amounts	1,604	1,316
Amortized intangibles, Accumulated Amortization	(904)	(804)
Patents and other
Finite And Indefinite Intangible Assets [Line Items]
Amortized intangibles, Gross Amounts	95	90
Amortized intangibles, Accumulated Amortization	$ (64)	$ (57)