Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax (benefit) expense	$ (67)	$ 36
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	88
Income Tax Rate Reconciliation [Line Items]
Earnings (loss) before income taxes	190	133
Income tax expense computed at United States statutory tax rate	67	47
U.S. government tax incentive - Energy Tax Credits	(84)	0
Foreign government tax incentive - BEFIEX	(6)	(4)
Other Adjustments	(44)	(7)
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax (benefit) expense	(67)	36
2013 Energy Tax credits recognized related to 2012 production [Member]
Income Tax Rate Reconciliation [Line Items]
U.S. government tax incentive - Energy Tax Credits	75
2013 Energy Tax credits recognized related to 2013 production [Member]
Income Tax Rate Reconciliation [Line Items]
U.S. government tax incentive - Energy Tax Credits	$ 9

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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-Name Regulation S-X (SX)

-Number 210

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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-Glossary Income Tax Expense (or Benefit)

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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-Publisher FASB

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to all other items not otherwise listed in the existing taxonomy.

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The sum of the differences between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to tax credits.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to foreign tax credits generated or utilized under enacted tax laws during the period.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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