Landfill and Environmental Remediation Liabilities - Changes to Landfill and Environmental Remediation Liabilities (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | ||
---|---|---|---|---|---|---|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
Environmental Remediation Liabilities [Member]
|
Dec. 31, 2012
Environmental Remediation Liabilities [Member]
|
Sep. 30, 2013
Landfill Liabilities [Member]
|
Dec. 31, 2012
Landfill Liabilities [Member]
|
|
Environmental Exit Cost [Line Items] | ||||||
Beginning balance, landfill | $ 1,338 | $ 1,292 | ||||
Beginning balance, environmental remediation | 253 | 273 | ||||
Obligations incurred and capitalized | 45 | 58 | ||||
Obligations settled | (53) | (87) | ||||
Obligations settled | (15) | (30) | ||||
Interest accretion | 65 | 62 | 65 | 84 | ||
Interest accretion | 3 | 4 | ||||
Revisions in cost estimates and interest rate assumptions | (8) | |||||
Revisions in cost estimates and interest rate assumptions | (4) | 5 | ||||
Acquisitions, divestitures and other adjustments | 3 | (1) | ||||
Acquisitions, divestitures and other adjustments | (1) | 1 | ||||
Ending balance, landfill | 1,398 | 1,338 | ||||
Ending balance, environmental remediation | $ 236 | $ 236 | $ 253 |