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Goodwill and Intangible Assets, Net - Narrative - Intangible Assets (Details)
3 Months Ended 6 Months Ended
Sep. 30, 2020
USD ($)
numberOfSegments
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2020
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Number of reportable segments | numberOfSegments 4        
Goodwill impairment charge $ 69,000,000 $ 0 $ 69,000,000 $ 0  
Goodwill 9,414,000,000   9,414,000,000   $ 9,360,000,000
Amortization expense of intangible assets 106,000,000 $ 118,000,000 212,000,000 $ 230,000,000  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]          
Estimated annual amortization expense, remainder of 2021 196,000,000   196,000,000    
Estimated annual amortization expense, 2022 367,000,000   367,000,000    
Estimated annual amortization expense, 2023 265,000,000   265,000,000    
Estimated annual amortization expense, 2024 248,000,000   248,000,000    
Estimated annual amortization expense, 2025 245,000,000   245,000,000    
Estimated annual amortization expense, thereafter 1,700,000,000   1,700,000,000    
International          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Goodwill impairment charge 69,000,000   69,000,000    
After-tax goodwill impairment 69,000,000   69,000,000    
Goodwill 1,456,000,000   1,456,000,000   $ 1,443,000,000
Retail Pharmacy Reporting Unit | International | Europe          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Goodwill $ 0   $ 0