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Contingencies (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
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 | The expiration dates of these guarantees vary from less than one year to more than 14 years. |
Litigation Contingencies |  |
Aggregate reserves for claims deemed both probable and reasonably estimable | 321,000,000 | 363,000,000
Loss Contingency Range Of Possible Loss Minimum | 881,000,000 |
Loss Contingency Range Of Possible Loss Maximum | 1,600,000,000 |
Guarantees |  |
Contingent Contractual Obligations [Line Items] |  |
Amount | 568,000,000 |
Number of Agreements | 19 |
Letters of credit under secured credit facility |  |
Contingent Contractual Obligations [Line Items] |  |
Amount | 5,000,000 |
Number of Agreements | 6 |
Cash Collateralized Letters Of Credit [Member] |  |
Contingent Contractual Obligations [Line Items] |  |
Amount | $ 215,000,000 |
Number of Agreements | 9 |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 + Details
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