Commitments and Contingencies (Environmental) (Details) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | |
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Sep. 30, 2012
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Dec. 31, 2011
|
|
Site Contingency [Line Items] | ||
Number Of Years Passed Since Alleged Release | 25 years | |
Accrual for Environmental Loss Contingencies Disclosure [Abstract] | ||
Accrual for Environmental Loss Contingencies | $ 72 | $ 81 |
Duncan, Oklahoma environmental matter
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Site Contingency [Line Items] | ||
Accrual for site contingency | 26 | |
Superfund sites
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Site Contingency [Line Items] | ||
Accrual for site contingency | $ 6 | |
Number of superfund sites | 9 |