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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 6,453 $ 6,392
Accumulated Amortization (3,363) (3,236)
Net Carrying Amount $ 3,090 3,156
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 11 years  
Gross Carrying Amount $ 3,679 3,650
Accumulated Amortization (2,025) (1,950)
Net Carrying Amount $ 1,654 1,700
Service agreements    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 10 years  
Gross Carrying Amount $ 1,002 994
Accumulated Amortization (497) (480)
Net Carrying Amount $ 505 514
Pharmacy licenses    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 26 years  
Gross Carrying Amount $ 497 492
Accumulated Amortization (240) (232)
Net Carrying Amount $ 257 260
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 12 years  
Gross Carrying Amount $ 826 808
Accumulated Amortization (259) (242)
Net Carrying Amount $ 567 566
Technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 3 years  
Gross Carrying Amount $ 177 175
Accumulated Amortization (117) (111)
Net Carrying Amount $ 60 64
Other    
Finite-Lived Intangible Assets [Line Items]    
Weighted- Average Remaining Amortization Period (Years) 5 years  
Gross Carrying Amount $ 272 273
Accumulated Amortization (225) (221)
Net Carrying Amount $ 47 $ 52