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Income Taxes Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2021 | Jun. 30, 2020
Income Taxes |  |  |  |
Income Tax Expense (Benefit) | $ 410 | $ 423 |  |
Effective Income Tax Rate Reconciliation, Percent | 61.80% | 7.90% |  |
Unrecognized tax benefits | $ 994 |  |  | $ 998
Unrecognized tax benefits that would impact effective tax rate | 750 |  |  | 753
Unrecognized tax benefits, interest and penalties accrued | 147 |  |  | 146
Gain (Loss) Related to Litigation Settlement | (1,038) | $ (5,673) |  |
Minimum |  |  |  |
Income Taxes |  |  |  |
Estimated range of decrease in unrecognized tax benefits within the next 12 months | 0 |  |  |
Maximum |  |  |  |
Income Taxes |  |  |  |
Estimated range of decrease in unrecognized tax benefits within the next 12 months | $ 370 |  |  |
Federal | Minimum |  |  |  |
Income Taxes |  |  |  |
Open Tax Year | 2008 |  |  |
Total Opioid Litigation [Member] |  |  |  |
Income Taxes |  |  |  |
Estimated Litigation Liability | $ 6,590 |  |  |
Income Tax Expense (Benefit) | 450 |  |  | (488)
Unrecognized tax benefits |  |  |  | 469
Gain (Loss) Related to Litigation Settlement | 1,020 | 5,630 |  |
Litigation Charges | 1,020 | $ 5,630 |  |
Total Opioid Litigation [Member] | Forecast [Member] |  |  |  |
Income Taxes |  |  |  |
Income Tax Expense (Benefit) |  |  | $ (35) |
Unrecognized tax benefits |  |  | $ 34 |
CareFusion [Member] |  |  |  |
Income Taxes |  |  |  |
Indemnification receivable | 179 |  |  | 176
Patient Recovery Business [Member] |  |  |  |
Income Taxes |  |  |  |
Indemnification receivable | $ 19 |  |  | $ 19

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