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Goodwill and Intangible Assets, Net - Narrative - Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Goodwill [Line Items]            
Goodwill and asset impairment charges $ 0 $ 570 $ 350 $ 570 $ 350  
Amortization expense of intangible assets 121   $ 126 243 $ 247  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]            
Estimated annual amortization expense, remainder of 2019 228     228    
Estimated annual amortization expense, 2020 443     443    
Estimated annual amortization expense, 2021 420     420    
Estimated annual amortization expense, 2022 405     405    
Estimated annual amortization expense, 2023 339     339    
Estimated annual amortization expense, thereafter 2,293     2,293    
European Pharmaceutical Solutions            
Goodwill [Line Items]            
Accumulated goodwill impairment losses 1,776     1,776   $ 1,299
Goodwill and asset impairment charges   $ 570   570    
Other            
Goodwill [Line Items]            
Accumulated goodwill impairment losses $ 456     456   $ 456
Goodwill and asset impairment charges       $ 0