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Goodwill and Intangible Assets, Net - Narrative - Intangible Assets (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Number of reportable segments | segment |  | 4 |  | 4 |  |  |
Goodwill impairment charge | $ 0 |  | $ 2,000,000 |  | $ 69,000,000 | $ 2,000,000 |
Goodwill | 9,511,000,000 |  |  | $ 9,511,000,000 | 9,511,000,000 |  | $ 9,360,000,000
Amortization expense of intangible assets | 108,000,000 |  | $ 113,000,000 |  | 320,000,000 | $ 343,000,000 |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |  |  |  |
Estimated annual amortization expense, remainder of 2021 | 96,000,000 |  |  | 96,000,000 | 96,000,000 |  |
Estimated annual amortization expense, 2022 | 371,000,000 |  |  | 371,000,000 | 371,000,000 |  |
Estimated annual amortization expense, 2023 | 272,000,000 |  |  | 272,000,000 | 272,000,000 |  |
Estimated annual amortization expense, 2024 | 254,000,000 |  |  | 254,000,000 | 254,000,000 |  |
Estimated annual amortization expense, 2025 | 251,000,000 |  |  | 251,000,000 | 251,000,000 |  |
Estimated annual amortization expense, thereafter | 1,700,000,000 |  |  | 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 | 1,526,000,000 |  |  | 1,526,000,000 | 1,526,000,000 |  | $ 1,443,000,000
Retail Pharmacy Reporting Unit | International | Europe |  |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |  |
Goodwill | $ 0 |  |  | $ 0 | $ 0 |  |

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