Landfill and Environmental Remediation Liabilities - Changes to Landfill and Environmental Remediation Liabilities (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2013
Areas
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Dec. 31, 2012
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Dec. 31, 2011
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Environmental Remediation Obligations [Abstract] | |||
Increase (decrease) related to year-end review of landfill capping closure and post closure obligations included in land liabilities | $ 20 | $ 15 | |
Increase related to landfill asset impairments | 23 | ||
Number of assets closed | 2 | ||
Risk-free discount rate of the obligations | 3.00% | 1.75% | 2.00% |
Increase (Decrease) to operating expenses due to change in discount rate used to estimate the present value of environmental remediation obligations | $ 18 | $ 3 |