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Business Combinations - Acquisition of RxCrossroads (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 02, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
Business Acquisition [Line Items]          
Cash purchase consideration   $ 905 $ 2,893 $ 4,212  
Goodwill   $ 9,358 $ 10,924 $ 10,586  
RxCrossroads          
Business Acquisition [Line Items]          
Cash purchase consideration $ 720        
Fair value of assets acquired (excluding goodwill and intangibles)         $ 129
Fair value of liabilities assumed         $ 57
Goodwill 386        
Intangible assets $ 262        
Weighted average life (years) 14 years