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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]        
Income tax (benefit) expense $ 55 $ 47 $ 27 $ 87
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 254 127 689 384
Income tax expense computed at United States statutory tax rate 89 44 241 134
U.S. government tax incentive - Energy Tax Credits (15) 0 (115) 0
Valuation allowance release 0 0 0 (55)
Foreign government tax incentive - BEFIEX (7) (4) (24) (11)
Other (12) 7 (75) 19
Income tax expense computed at effective worldwide tax rates (55) (47) (27) (87)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 43   43  
2013 Energy Tax credits recognized related to 2012 production
       
Income Tax Rate Reconciliation [Line Items]        
U.S. government tax incentive - Energy Tax Credits     (75)  
2013 Energy Tax credits recognized related to 2013 production
       
Income Tax Rate Reconciliation [Line Items]        
U.S. government tax incentive - Energy Tax Credits     $ (40)