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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Income Taxes |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | (89.70%) | 2.10% | 22.10% |
Income Tax Expense (Benefit) |  | $ (289) | $ (79) | $ 386 |
Effective Tax Rate Impact From Certain Foreign Jurisdictions |  | $ 20 |  |  |
Provision at Federal statutory rate |  | 21.00% | 21.00% | 21.00% |
Federal |  | $ (539) | $ 822 | $ 28 |
Deferred tax assets on tax credit carryforwards |  | (805) | (589) |  |
Valuation allowance on operating loss carryforwards |  | 477 |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 303 | 849 | 753 | 303 |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  | 223 | 78 | 39 |
Unrecognized tax benefits | 456 | 932 | 998 | 456 | $ 423
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | 271 | 6 | 25 |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | 1 | 3 | 0 |
Unrecognized tax benefits, interest and penalties accrued | 122 | 49 | 146 | 122 |
Unrecognized tax benefits, interest and penalties | $ 16 |  |  | $ 8 |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense |  | 825 |  |  |
Deferred income taxes and other liabilities |  | 9,670 | 8,594 |  |
Net Operating Loss Carryback |  |  |  |  |
Income Taxes |  |  |  |  |
Income Tax Expense (Benefit) |  | (424) |  |  |
Income Taxes Receivable |  | 974 |  |  |
Deferred income taxes and other liabilities |  | 700 |  |  |
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 |  | 20 |  |  |
Federal |  |  |  |  |
Income Taxes |  |  |  |  |
Tax credit carryforwards |  | 272 |  |  |
State and Local |  |  |  |  |
Income Taxes |  |  |  |  |
Tax credit carryforwards |  | 3,900 |  |  |
Foreign |  |  |  |  |
Income Taxes |  |  |  |  |
Tax credit carryforwards |  | 2,300 |  |  |
Patient Recovery Business [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority |  | 12 | 19 |  |
CareFusion [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority |  | 72 | 176 |  |
Total Opioid Litigation [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Estimated Litigation Liability |  | 6,730 |  |  |
Income Tax Expense (Benefit) |  | 228 | 488 |  |
Unrecognized tax benefits that would impact effective tax rate |  | 219 | 469 |  |
Litigation Settlement, Expense |  | $ 1,170 | $ 5,630 |  |

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