Identifiable Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite and indefinite-lived intangible assets	$ 1,216	$ 1,080
Accumulated amortization	234	214
Customer relationships and lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	745	644
Accumulated amortization	121	112
Non-compete agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	84	83
Accumulated amortization	32	30
Tradenames, patents and trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite and indefinite-lived intangible assets	165	144
Accumulated amortization	17	16
Land And water rights
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite and indefinite-lived intangible assets	72	87
Accumulated amortization	6	6
Fuel and power agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	25	17
Accumulated amortization	20	12
Software
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	23	22
Accumulated amortization	19	19
Other intangible assets
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	102	83
Accumulated amortization	$ 19	$ 19