Identifiable Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite and Indefinite lived intangible assets	$ 945	$ 504
Accumulated Amortization	216	183
Customer Relationships And Lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	567	227
Accumulated Amortization	107	82
Non-compete agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	92	72
Accumulated Amortization	26	19
Tradenames, Patents And Trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite and Indefinite lived intangible assets	143	51
Accumulated Amortization	29	21
Land And Water Rights
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite and Indefinite lived intangible assets	64	60
Accumulated Amortization	5	3
Fuel And Power Agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	20	30
Accumulated Amortization	12	16
Software
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	22	37
Accumulated Amortization	22	29
Other Intangible Assets
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-lived intangible assets	37	27
Accumulated Amortization	$ 15	$ 13