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Goodwill and Other Intangibles - Goodwill and Disposal (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 02, 2018
Goodwill                
Goodwill, impairment loss     $ 0   $ 181      
Cumulative goodwill impairments   $ 181     $ 181      
Statutory income tax rate 21.00%       35.00% 35.00% 35.00%  
Income tax provision         $ 1,637 $ 3,317 $ 3,386  
Goodwill [Roll Forward]                
Goodwill, beginning balance $ 38,451       38,249 38,106    
Acquisitions         385 126    
Foreign currency translation adjustments         (2) 17    
Impairment     $ 0   (181)      
Goodwill, ending balance   38,451     38,451 38,249 38,106  
Pharmacy Services Segment                
Goodwill [Roll Forward]                
Goodwill, beginning balance 21,819       21,637 21,685    
Acquisitions         182      
Other           (48)    
Goodwill, ending balance   21,819     21,819 21,637 21,685  
Retail/LTC Segment                
Goodwill                
Goodwill, impairment loss         181      
Goodwill [Roll Forward]                
Goodwill, beginning balance $ 16,632       16,612 16,421    
Acquisitions         203 126    
Foreign currency translation adjustments         (2) 17    
Impairment         (181)      
Other           48    
Goodwill, ending balance   16,632     16,632 $ 16,612 $ 16,421  
Rx Crossroads Member                
Goodwill                
Goodwill, impairment loss   46   $ 135        
Deferred tax liability decrease         47      
Income tax provision         $ 47      
Adjustment to goodwill related to Tax Cuts and Jobs Act   47            
Goodwill [Roll Forward]                
Impairment   $ (46)   $ (135)        
Disposal group                
Consideration               $ 725