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Contingencies (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 integer | Dec. 31, 2010
Environmental Contingencies Disclosure [Abstract] |  |
Liability recorded for projected environmental remediation costs | $ 26,000,000 |
Guarantees Letters Of Credit [Abstract] |  |
Obligations made by the Parent Company associated with non-recourse debt | 24,000,000 |
Contingent Contractual Obligations [Line Items] |  |
Amount | 624,000,000 |
Number of Agreements | 46 |
Letter of credit fee range (minimum) | 0.25% |
Letter of credit fee range (maximum) | 3.25% |
Litigation Contingency Disclosure [Abstract] |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | 363,000,000 | 443,000,000
Range of reasonably possible potential losses, minimum | 355,000,000 |
Range of reasonably possible potential losses, maximum | 1,700,000,000 |
Guarantees |  |
Contingent Contractual Obligations [Line Items] |  |
Amount | 351,000,000 |
Number of Agreements | 22 |
Maximum Exposure Range for Each Agreement | 53 |
Letters of credit under secured credit facility |  |
Contingent Contractual Obligations [Line Items] |  |
Amount | 12,000,000 |
Number of Agreements | 11 |
Maximum Exposure Range for Each Agreement | 7 |
Cash Collateralized Letters Of Credit [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Amount | $ 261,000,000 |
Number of Agreements | 13 |
Maximum Exposure Range for Each Agreement | 221 |

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