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Contingencies and Commitments (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Environmental Contingencies |  |
Liability recorded for projected environmental remediation costs | $ 14,000,000 |
Guarantees Letters Of Credit [Abstract] |  |
The range of expiration dates of guarantees made by the Parent Company | less than one year to more than 21 years |
Obligations made by the Parent Company associated with non-recourse debt | 24,000,000 |
Contingent Contractual Obligations [Line Items] |  |
Amount | 834,000,000 |
Number of Agreements | 38 |
Commitments to invest in subsidiaries, excluding letters of credit | 2,000,000 |
Litigation Contingencies |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | 345,000,000 | 321,000,000
Loss Contingency Range Of Possible Loss Minimum | 944,000,000 |
Loss Contingency Range Of Possible Loss Maximum | 1,600,000,000 |
Guarantees |  |
Contingent Contractual Obligations [Line Items] |  |
Amount | 577,000,000 |
Number of Agreements | 20 |
Maximum Exposure Range for Each Agreement | <$1 - $231 |
Letters of credit under secured credit facility |  |
Contingent Contractual Obligations [Line Items] |  |
Amount | 3,000,000 |
Number of Agreements | 5 |
Maximum Exposure Range for Each Agreement | <$1 - $2 |
Letters of credit under secured credit facility | Minimum |  |
Contingent Contractual Obligations [Line Items] |  |
Letter of credit fees paid | 0.25% |
Letters of credit under secured credit facility | Maximum |  |
Contingent Contractual Obligations [Line Items] |  |
Letter of credit fees paid | 3.25% |
Cash Collateralized Letters Of Credit [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Amount | $ 254,000,000 |
Number of Agreements | 13 |
Maximum Exposure Range for Each Agreement | <$1 - $169 |

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