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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Millions
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Non controlling Interest
Balance at Dec. 31, 2015 $ 2,168 $ 0 $ 956 $ (10) $ 1,358 $ (147) $ 11
Balance (in shares) at Dec. 31, 2015   253,710          
Balance Treasury stock (in shares) at Dec. 31, 2015           13,024  
Increase (Decrease) in Stockholders' Equity              
Net earnings 563       562   1
Other comprehensive (loss) earnings, net of tax (26)     (26)     0
Common stock issued for acquisitions 3,105   3,074     $ 31  
Common stock issued for acquisitions (in shares)   96,436       2,750  
Common stock issued for employee benefit plans 12   12        
Common stock issued for employee benefit plans (in shares)   6,122          
Common stock repurchases (63)         $ (63)  
Common stock repurchases (in shares)           2,156  
Stock compensation expense 148   148        
Contribution from noncontrolling interest 2           2
Balance at Dec. 31, 2016 5,909 $ 0 4,190 (36) 1,920 $ (179) 14
Balance (in shares) at Dec. 31, 2016   356,268          
Balance Treasury stock (in shares) at Dec. 31, 2016           12,430  
Increase (Decrease) in Stockholders' Equity              
Net earnings 828       828   0
Other comprehensive (loss) earnings, net of tax 33     33      
Common stock issued for employee benefit plans 11   11        
Common stock issued for employee benefit plans (in shares)   4,490          
Common stock repurchases $ (65)         $ (65)  
Common stock repurchases (in shares) 1,000         1,454  
Stock compensation expense $ 135   135        
Purchase of noncontrolling interest 13   13        
Balance at Dec. 31, 2017 $ 6,864 $ 0 4,349 (3) 2,748 $ (244) 14
Balance (in shares) at Dec. 31, 2017 346,874 360,758          
Balance Treasury stock (in shares) at Dec. 31, 2017 13,884         13,884  
Increase (Decrease) in Stockholders' Equity              
Net earnings $ 898       900   (2)
Other comprehensive (loss) earnings, net of tax (53)     (53)      
Common stock issued for acquisitions 507 $ 0 331     $ 176  
Common stock issued for acquisitions (in shares)   0       9,787  
Common stock issued for stock offering 2,779 $ 0 2,779        
Stock issued, shares (in shares)   53,207          
Common stock issued for employee benefit plans 17 $ 0 17        
Common stock issued for employee benefit plans (in shares)   3,730          
Common stock repurchases $ (71)         $ (71)  
Common stock repurchases (in shares) 1,000         1,120  
Stock compensation expense $ 145   145        
Purchase of noncontrolling interest (187)   (172)       (15)
Acquisition resulting in noncontrolling interest 99           99
Balance at Dec. 31, 2018 $ 11,013 $ 0 $ 7,449 $ (56) $ 3,663 $ (139) $ 96
Balance (in shares) at Dec. 31, 2018 412,478 417,695          
Balance Treasury stock (in shares) at Dec. 31, 2018 5,217         5,217