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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 7,193 $ 6,681
Accumulated Amortization (2,935) (2,579)
Net Carrying Amount $ 4,258 4,102
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Amortization Period (years) 13 years  
Gross Carrying Amount $ 4,038 3,619
Accumulated Amortization (1,724) (1,550)
Net Carrying Amount $ 2,314 2,069
Service agreements    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Amortization Period (years) 12 years  
Gross Carrying Amount $ 1,020 1,037
Accumulated Amortization (392) (386)
Net Carrying Amount $ 628 651
Pharmacy licenses    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Amortization Period (years) 25 years  
Gross Carrying Amount $ 766 684
Accumulated Amortization (336) (196)
Net Carrying Amount $ 430 488
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Amortization Period (years) 14 years  
Gross Carrying Amount $ 938 932
Accumulated Amortization (207) (187)
Net Carrying Amount $ 731 745
Technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Amortization Period (years) 4 years  
Gross Carrying Amount $ 146 147
Accumulated Amortization (87) (84)
Net Carrying Amount $ 59 63
Other    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Amortization Period (years) 5 years  
Gross Carrying Amount $ 285 262
Accumulated Amortization (189) (176)
Net Carrying Amount $ 96 $ 86