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Commitments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Leases Operating Abstract |  |  |
Rental Expense Under Operating Lease Commitments | $ 63,000,000 | $ 56,000,000 | $ 60,000,000
Operating Leases Future Minimum Payments Due Abstract |  |  |
Future Minimum Lease Payments Under Operating Lease 2012 | 57,000,000 |  |
Future Minimum Lease Payments Under Operating Lease 2013 | 57,000,000 |  |
Future Minimum Lease Payments Under Operating Lease 2014 | 55,000,000 |  |
Future Minimum Lease Payments Under Operating Lease 2015 | 54,000,000 |  |
Future Minimum Lease Payments Under Operating Lease 2016 | 54,000,000 |  |
Future Minimum Lease Payments Under Operating Lease Thereafter | 730,000,000 |  |
Future Minimum Lease Payments Under Operating Lease Total | 1,007,000,000 |  |
Leases Capital Abstract |  |  |
Gross Value Of Leased Assets | 95,000,000 | 97,000,000 |
Capital Leases Future Minimum Payments Due [Abstract] |  |  |
Future Minimum Lease Payments Under Capital Leases 2012 | 14,000,000 |  |
Future Minimum Lease Payments Under Capital Leases 2013 | 11,000,000 |  |
Future Minimum Lease Payments Under Capital Leases 2014 | 10,000,000 |  |
Future Minimum Lease Payments Under Capital Leases 2015 | 9,000,000 |  |
Future Minimum Lease Payments Under Capital Leases 2016 | 9,000,000 |  |
Future Minimum Lease Payments Under Capital Leases Thereafter | 125,000,000 |  |
Future Minimum Lease Payments Under Capital Leases Total | 178,000,000 |  |
Future Minimum Lease Payments Under Capital Leases Less Imputed | 106,000,000 |  |
Present Value Of Total Minimum Lease Payments | 72,000,000 |  |
Long-term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | 2,500,000,000 | 2,400,000,000 | 2,100,000,000
Electricity Purchase Contracts [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Future Commitments 2012 | 2,800,000,000 |  |
Future Commitments 2013 | 2,412,000,000 |  |
Future Commitments 2014 | 2,034,000,000 |  |
Future Commitments 2015 | 1,995,000,000 |  |
Future Commitments 2016 | 1,979,000,000 |  |
Future Commitments Thereafter | 23,887,000,000 |  |
Future Commitments Total | 35,107,000,000 |  |
Fuel Purchase Contracts [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | 1,700,000,000 | 1,700,000,000 | 1,200,000,000
Future Commitments 2012 | 1,980,000,000 |  |
Future Commitments 2013 | 1,187,000,000 |  |
Future Commitments 2014 | 790,000,000 |  |
Future Commitments 2015 | 663,000,000 |  |
Future Commitments 2016 | 661,000,000 |  |
Future Commitments Thereafter | 4,875,000,000 |  |
Future Commitments Total | 10,156,000,000 |  |
Other Purchase Contracts [Member] |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Purchases Under Long Term Contracts | 1,800,000,000 | 1,700,000,000 | 2,800,000,000
Future Commitments 2012 | 1,853,000,000 |  |
Future Commitments 2013 | 1,476,000,000 |  |
Future Commitments 2014 | 1,232,000,000 |  |
Future Commitments 2015 | 990,000,000 |  |
Future Commitments 2016 | 906,000,000 |  |
Future Commitments Thereafter | 9,618,000,000 |  |
Future Commitments Total | $ 16,075,000,000 |  |

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- Definition Amount necessary to reduce net minimum lease payments to present value calculated at the lesser of the interest rate implicit in the lease (if known) or the entity's incremental borrowing rate (as defined) at inception of the lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 10 -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph a(ii) -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 Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 7 -Subparagraph d -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The total of future contractually required payments on leases defined as operating. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -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 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -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 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the third year of the balance sheet date relating to leases defined as operating. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -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 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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