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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Income Taxes |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | 24.20% | 36.30% | 23.20% | 36.70% |  |
Goodwill impairment |  |  |  | $ 671 |  |  |
Income Tax Expense (Benefit) |  | $ (82) | $ (197) | (186) | $ (189) |  |
Unrecognized tax benefits |  | 937 |  | 937 |  |  | $ 1,000
Unrecognized tax benefits that would impact effective tax rate |  | 850 |  | 850 |  |  | 873
Unrecognized tax benefits, interest and penalties accrued |  | 57 |  | 57 |  |  | 65
Global Medical Products and Distribution | Subsequent Event |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Income Tax Expense (Benefit) | $ 36 |  |  |  |  |  |
Forecast [Member] | Global Medical Products and Distribution |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  | $ 56 |
Minimum |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Estimated range of decrease in unrecognized tax benefits within the next 12 months |  | 0 |  | 0 |  |  |
Maximum |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Estimated range of decrease in unrecognized tax benefits within the next 12 months |  | 20 |  | 20 |  |  |
CareFusion [Member] |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Indemnification Receivable |  | $ 20 |  | $ 20 |  |  | $ 82

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