Income Taxes - Additional information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Taxes [Line Items]
Effective tax rate	44.70%	33.20%	37.80%	33.00%
Income tax expense (benefit)	$ 180	$ 127	$ 279	$ 213
Tax charge			32
Equity in net losses of unconsolidated entities	13	8	22	16
Percentage of qualifying capital expenditures on property depreciated immediately					50.00%
Puerto Rico Operation And Certain Other Collection And Landfill Assets [Member]
Income Taxes [Line Items]
Gain loss on sale of business			(25)
Income tax expense (benefit)			0
Investment in Refined Coal Facility [Member]
Income Taxes [Line Items]
Equity in net losses of unconsolidated entities	2	2	2	3
Income tax benefit, including tax credits, from equity method investment	5	6	8	9
Low-Income Housing Properties [Member]
Income Taxes [Line Items]
Equity in net losses of unconsolidated entities	6	6	12	12
Income tax benefit, including tax credits, from equity method investment	9	10	17	17
Interest expense	2	2	3	3
Tax credits from equity method investment	$ 6	$ 7	$ 11	$ 11