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Long-Term Debt (Details Textual) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2011 | Dec. 31, 2011 Five year revolving credit facility [Member] | Dec. 31, 2011 7.25% interest payable semiannually on Senior Notes due on May 1, 2011 [Member] | May 01, 2011 7.25% interest payable semiannually on Senior Notes due on May 1, 2011 [Member] | Dec. 31, 2010 7.25% interest payable semiannually on Senior Notes due on May 1, 2011 [Member] | Dec. 31, 2011 5.65% interest payable semiannually on Senior Notes due on November 15, 2012 [Member] | Dec. 31, 2010 5.65% interest payable semiannually on Senior Notes due on November 15, 2012 [Member] | Dec. 31, 2011 5.5% interest payable semiannually on Senior Notes due on November 19, 2012 [Member] | Dec. 31, 2010 5.5% interest payable semiannually on Senior Notes due on November 19, 2012 [Member] | Dec. 31, 2011 6.5% interest payable semiannually on Senior Notes due on March 15, 2011 [Member] | Mar. 15, 2011 6.5% interest payable semiannually on Senior Notes due on March 15, 2011 [Member] | Dec. 31, 2010 6.5% interest payable semiannually on Senior Notes due on March 15, 2011 [Member] | Dec. 31, 2011 6.125% interest payable semiannually on Senior Notes due on August 15, 2015 [Member] | Dec. 31, 2010 6.125% interest payable semiannually on Senior Notes due on August 15, 2015 [Member]
Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  | 7.25% |  |  | 5.65% |  | 5.50% |  | 6.50% |  |  | 6.125% |
Cash prepaid, unsecured senior notes |  |  | $ 0 | $ 200,000,000 | $ 201,000,000 | $ 200,000,000 | $ 200,000,000 | $ 150,000,000 | $ 151,000,000 | $ 0 | $ 150,000,000 | $ 150,000,000 | $ 151,000,000 | $ 151,000,000
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit | 862,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funds available under revolving credit facility | 1,138,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit under various bilateral committed letter of credit facilities | $ 1,863,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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