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Condensed Consolidated Statements of Equity (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Cash dividends declared (in dollars per share) $ 0.22 $ 0.19 $ 0.44 $ 0.38 $ 0.82  
Noncontrolling interest $ 84   $ 84   $ 80  
Other comprehensive earnings, net of taxes, attributable to noncontrolling interest (12) $ 12 3 $ 16    
Net earnings attributable to noncontrolling interest $ 2 2 $ 8 5    
Noncontrolling Interest            
Noncontrolling interest   $ 72   72   $ 54
Change in noncontrolling interest       18    
Other comprehensive earnings, net of taxes, attributable to noncontrolling interest       16    
Net earnings attributable to noncontrolling interest       5    
Dividends paid to noncontrolling interest       $ (3)