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Business Acquisitions and Divestitures - Acquisition of RxCrossroads (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Jan. 02, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]          
Cash purchase consideration     $ 133 $ 905 $ 2,893
Goodwill     $ 9,360 $ 9,358 $ 10,924
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