Variable Interest Entities - Additional Information (Detail)
In Millions, unless otherwise specified |
12 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2012
USD ($)
|
Dec. 31, 2011
USD ($)
|
Dec. 31, 2010
USD ($)
|
Dec. 31, 2012
Limited Liability Company II [Member]
|
Dec. 31, 2012
Limited Liability Company [Member]
|
Dec. 31, 2012
Limited Liability Company [Member]
Limited Liability Company II [Member]
USD ($)
|
Dec. 31, 2011
Limited Liability Company [Member]
Limited Liability Company II [Member]
USD ($)
|
Dec. 31, 2000
Limited Liability Company [Member]
Limited Liability Company II [Member]
USD ($)
|
Dec. 31, 2012
Investment in Recycling and Waste to Energy
USD ($)
|
Dec. 31, 2012
Investment in Recycling and Waste to Energy
GBP (£)
|
Jan. 31, 2011
Investment in Refined Coal Facility [Member]
USD ($)
|
Dec. 31, 2012
Investment in Refined Coal Facility [Member]
USD ($)
|
Dec. 31, 2011
Investment in Refined Coal Facility [Member]
USD ($)
|
Apr. 30, 2010
Low-Income Housing Properties [Member]
USD ($)
|
Dec. 31, 2012
Low-Income Housing Properties [Member]
USD ($)
|
Dec. 31, 2011
Low-Income Housing Properties [Member]
USD ($)
|
|
Business Acquisition [Line Items] | ||||||||||||||||
Percentage of ownership in LLC's | 0.25% | 0.50% | 50.00% | 50.00% | ||||||||||||
Percentage of variable interest entities owned by other companies | 99.75% | 99.50% | ||||||||||||||
Total initial investment by other companies | $ 167 | |||||||||||||||
Under the LLC agreements, the LLC shall be dissolved upon the occurrence of any of the following events | (i) a written decision of all members of the LLCs; (ii) December 31, 2063; (iii) a court's dissolution of the LLCs; or (iv) the LLCs ceasing to own any interest in the waste-to-energy facilities. | |||||||||||||||
Reporting entity percentage of interest in earnings of variable interest entity after achieving targeted returns | 80.00% | |||||||||||||||
Other companies percentage of interest in earnings of variable interest entity after achieving targeted returns | 20.00% | |||||||||||||||
Net property and equipment | 296 | 308 | ||||||||||||||
Noncontrolling Interest | 321 | 320 | 245 | 246 | ||||||||||||
Expense recognized for other companies' noncontrolling interests in LLCs' earnings | 45 | 50 | 50 | |||||||||||||
Expected cost to construct Waste-to-Energy LLC facility | 325 | 200 | ||||||||||||||
Total commitment | 93 | 57 | ||||||||||||||
Note receivables balance from the LLC | 13 | 8 | ||||||||||||||
Investment balance | 443 | 458 | 1 | 19 | 35 | 153 | 178 | |||||||||
Cash payments to acquire equity method investment | 48 | 6 | ||||||||||||||
Consideration for investment | 221 | |||||||||||||||
Value of notes payable included in consideration for investment | 215 | |||||||||||||||
Equity method investments debt balance | 152 | 176 | ||||||||||||||
Variable interest entities primary beneficiary trust fair value assets | 122 | 123 | ||||||||||||||
Carrying value of restricted trust funds and escrow accounts for which company is not the sole beneficiary specifically for future settlement of landfill and environmental remediation liabilities | $ 110 | $ 107 |