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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]        
Income tax (benefit) expense $ 39 $ 4 $ (28) $ 40
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00% 35.00% 35.00% 35.00%
Income Tax Rate Reconciliation [Line Items]        
Earnings before income taxes 245 124 435 257
Income tax expense computed at United States statutory tax rate 85 43 152 90
U.S. government tax incentive - Energy Tax Credits (16) 0 (100) 0
Valuation allowance release 0 (55) 0 (55)
Foreign government tax incentive - BEFIEX (11) (3) (17) (7)
Other Adjustments (19) 19 (63) 12
Income tax (benefit) expense (39) (4) 28 (40)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 53   53  
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     $ (25)