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Commitments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Leases, Operating [Abstract] |  |  |
Rental Expense Under Operating Lease Commitments | $ 58 | $ 63 | $ 56
OperatingLeasesFutureMinimumPaymentsDueAbstract |  |  |
Future Minimum Lease Payments Under Operating Lease 2013 | 53 |  |
Future Minimum Lease Payments Under Operating Lease 2014 | 51 |  |
Future Minimum Lease Payments Under Operating Lease 2015 | 48 |  |
Future Minimum Lease Payments Under Operating Lease 2016 | 47 |  |
Future Minimum Lease Payments Under Operating Lease 2017 | 47 |  |
Future Minimum Lease Payments Under Operating Lease Thereafter | 517 |  |
Future Minimum Lease Payments Under Operating Lease Total | 763 |  |
Leases Capital [Abstract] |  |  |
Gross Value Of Leased Assets | 94 | 95 |
Capital Leases Future Minimum Payments Due [Abstract] |  |  |
Future Minimum Lease Payments Under Capital Leases 2013 | 12 |  |
Future Minimum Lease Payments Under Capital Leases 2014 | 12 |  |
Future Minimum Lease Payments Under Capital Leases 2015 | 11 |  |
Future Minimum Lease Payments Under Capital Leases 2016 | 11 |  |
Future Minimum Lease Payments Under Capital Leases 2017 | 11 |  |
Future Minimum Lease Payments Under Capital Leases Thereafter | 160 |  |
Future Minimum Lease Payments Under Capital Leases Total | 217 |  |
Future Minimum Lease Payments Under Capital Leases Less Imputed | 138 |  |
Present Value Of Total Minimum Lease Payments | 79 |  |
Electricity Purchase Contracts [Member] |  |  |
LongTermPurchaseCommitmentLineItems |  |  |
Purchases Under Long Term Contracts | 2,819 | 2,463 | 2,422
Future Commitments 2013 | 2,599 |  |
Future Commitments 2014 | 3,008 |  |
Future Commitments 2015 | 2,952 |  |
Future Commitments 2016 | 2,971 |  |
Future Commitments 2017 | 2,351 |  |
Future Commitments Thereafter | 25,001 |  |
Future Commitments Total | 38,882 |  |
Brazil Electricity Purchase Contracts Term Range | Electricity purchase contracts primarily include energy auction agreements at our Brazil subsidiaries with extended terms from 2013 through 2028 |  |
Fuel Purchase Contracts [Member] |  |  |
LongTermPurchaseCommitmentLineItems |  |  |
Purchases Under Long Term Contracts | 1,860 | 1,577 | 1,686
Future Commitments 2013 | 1,555 |  |
Future Commitments 2014 | 998 |  |
Future Commitments 2015 | 555 |  |
Future Commitments 2016 | 428 |  |
Future Commitments 2017 | 416 |  |
Future Commitments Thereafter | 4,618 |  |
Future Commitments Total | 8,570 |  |
Other Purchase Contracts [Member] |  |  |
LongTermPurchaseCommitmentLineItems |  |  |
Purchases Under Long Term Contracts | 1,701 | 1,767 | 1,652
Future Commitments 2013 | 1,976 |  |
Future Commitments 2014 | 1,743 |  |
Future Commitments 2015 | 1,629 |  |
Future Commitments 2016 | 1,202 |  |
Future Commitments 2017 | 1,093 |  |
Future Commitments Thereafter | 11,153 |  |
Future Commitments Total | $ 18,796 |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: 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 2: 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 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 Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: 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 2: 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 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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