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COMMON STOCK - Treasury Stock (Narrative) (Details) - USD ($)
shares in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Treasury Stock        
Aggregate cost of stock repurchases   $ 795,500,000 $ 763,300,000 $ 662,300,000
Retirement of treasury stock (in shares) 33.6      
Retirement of treasury stock (Note 13)     $ 0  
Treasury Stock        
Treasury Stock        
Shares repurchased (in shares)   5.5 7.7 7.3
Aggregate cost of stock repurchases   $ 795,500,000 $ 763,300,000 $ 662,300,000
Retirement of treasury stock (in shares)     33.6  
Retirement of treasury stock (Note 13) $ 2,700,000,000 0 $ (2,746,200,000) $ 0
Common Stock        
Treasury Stock        
Retirement of treasury stock (in shares)     33.6  
Retirement of treasury stock (Note 13) 33,600,000   $ 33,600,000  
Additional Paid-in Capital        
Treasury Stock        
Retirement of treasury stock (Note 13) 175,500,000   175,500,000  
Retained Earnings        
Treasury Stock        
Retirement of treasury stock (Note 13) $ 2,500,000,000   $ 2,537,100,000  
November 2017        
Treasury Stock        
Authorized amount for share repurchase   $ 1,000,000,000.0