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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Federal Statutory Income Tax Rate, Percent 35.00% 35.00% 35.00% 35.00%
Earnings before income taxes $ 261 $ 254 $ 710 $ 689
Income tax expense computed at United States statutory tax rate 91 89 249 241
U.S. government tax incentives, including Energy Tax Credits 0 (16) 0 (127)
U.S. foreign income items, net of credits (34) 3 (59) (19)
Valuation allowance release (25) 0 (38) 0
Foreign government tax incentive, including BEFIEX (10) (16) (20) (45)
Other 4 (5) (6) (23)
Income tax expense computed at effective worldwide tax rates $ 26 $ 55 $ 126 $ 27