Identifiable Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite and indefinite-lived intangible assets	$ 1,198	$ 1,080
Accumulated amortization	243	214
Customer relationships and lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	737	644
Accumulated amortization	125	112
Non-compete agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	79	83
Accumulated amortization	38	30
Tradenames, patents and trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite and indefinite-lived intangible assets	161	144
Accumulated amortization	16	16
Land And water rights
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite and indefinite-lived intangible assets	69	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	18	17
Accumulated amortization	14	12
Software
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	29	22
Accumulated amortization	28	19
Other intangible assets
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross carrying amount, finite-lived intangible assets	105	83
Accumulated amortization	$ 16	$ 19