Income Taxes - Components of Net Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Net operating loss, capital loss and tax credit carry-forwards	$ 189	$ 175
Landfill and environmental remediation liabilities		17
Miscellaneous and other reserves	301	286
Subtotal	490	478
Valuation allowance	(120)	(100)
Landfill and environmental remediation liabilities	(11)
Property and equipment	(1,180)	(1,204)
Goodwill and other intangibles	(1,050)	(980)
Net deferred tax liabilities	$ (1,871)	$ (1,806)