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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Federal Statutory Income Tax Rate, Percent 35.00% 35.00%
Earnings before income taxes $ 214 $ 190
Income tax expense computed at United States statutory tax rate 75 67
U.S. government tax incentives, including Energy Tax Credits 0 (94)
U.S. foreign income items, net of credits (12) (22)
Foreign government tax incentive, including BEFIEX (5) (11)
Other (8) (7)
Income tax (benefit) expense computed at effective worldwide tax rates $ 50 $ (67)