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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Earnings before income taxes $ 286 $ 275 $ 501 $ 482
Income tax (benefit) expense computed at United States statutory tax rate 100 96 175 169
Valuation allowance releases (105) 0 (105) (58)
Audits and settlements (32) 2 (32) 1
U.S. foreign income items, net of credits (6) (11) (11) (13)
Foreign government tax incentive (2) (4) (4) (8)
Other (11) 7 (20) 8
Income tax (benefit) expense computed at effective worldwide tax rates $ (56) $ 90 $ 3 $ 99