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Restructuring, Impairment, and Related Charges - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment, and related charges, net	$ 245	$ 219	$ 156
Employee Severance, Exit-related Costs and Asset Impairment Charges
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment, and related charges, net			15
International
Restructuring Cost and Reserve [Line Items]
Long-lived asset impairment charges, before tax	36	115	112
International | Retail Pharmacy Reporting Unit [Member]
Restructuring Cost and Reserve [Line Items]
Long-lived asset impairment charges, before tax			82
International | Rexall Health
Restructuring Cost and Reserve [Line Items]
Long-lived asset impairment charges, before tax			30
U.K. | International
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment, and related charges, net		57
Restructuring Plan, Remote Work Transitioning
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment, and related charges, net	$ 124
Strategic Growth Initiative Plan - Additional Global Reorganization and Business Consolidation Programs | Employee Severance, Accelerated Depreciation and Project Consulting Fees
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment, and related charges, net		62	72
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Employee Retention Expenses, Asset Impairments and Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Restructuring, impairment, and related charges, net		$ 28	$ 44

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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