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BASIS OF PREPARATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. (Stock-based compensation) (Details)
12 Months Ended
Dec. 31, 2018
share_based_compensation_plan
shares
Dec. 31, 2016
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Grant-date fair value per option awarded (in dollars per share) | $ / shares   $ 10.62
Stock compensation plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for future grant (shares) | shares 20,024,786  
Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Expected life in years   6 years 9 months
Expected volatility   20.00%
Dividend yield   2.50%
Risk-free interest rate   1.60%
Employee stock-based compensation programs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stockholder-approved plans 3  
Employee stock-based compensation programs [Member] | Restricted shares and restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Graded vesting period 5 years  
Employee stock-based compensation programs [Member] | Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term 10 years  
Non-employee director plans [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stockholder-approved plans 2  
Graded vesting period 1 year  
Non-employee director plans [Member] | Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Term 10 years