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Debt (Details Textual) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2012 Five year revolving credit facility [Member] | Dec. 31, 2011 5.65% interest payable semi annually on Senior Notes due on November 15, 2012 [Member] | Dec. 31, 2011 5.5% interest payable semi annually on Senior Notes due on November 19, 2012 [Member] | Dec. 31, 2011 6.125% interest payable semi annually on Senior Notes due on August 15, 2015 [Member]
Debt (Textual) [Abstract] |  |  |  |  |
Senior notes interest rate |  |  | 5.65% | 5.50% | 6.125%
Line of Credit Facility [Line Items] |  |  |  |  |
Unsecured revolving credit facility |  | $ 2,000,000,000 |  |  |
Outstanding letters of credit | 985,000,000 | 0 |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |
Funds available under revolving credit facility | 1,015,000,000 |  |  |  |
Outstanding letters of credit under various bilateral committed letter of credit facilities | $ 1,893,000,000 |  |  |  |
Interest rate under multicurrency facility | LIBOR, NIBOR or EURIBOR plus 0.26% |  |  |  |
Variable rate basis | LIBOR, NIBOR or EURIBOR |  |  |  |
Variable rate | 0.26% |  |  |  |

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- Definition Outstanding letters of credit under various bilateral committed letter of credit facilities. + References No definition available. + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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