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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2020 | Jun. 30, 2017
Income Taxes |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | 2.10% | 22.10% | 213.80% |  |
Income Tax Expense (Benefit) |  | $ (79) | $ 386 | $ (487) |  |
Effective Tax Rate Impact From Certain Foreign Jurisdictions |  | $ 17 |  |  |  |
Provision at Federal statutory rate |  | 21.00% | 21.00% | 28.10% |  |
Federal |  | $ 822 | $ 28 | $ 1,003 |  |
Deferred tax assets on tax credit carryforwards |  | (589) | (621) |  |  |
Valuation allowance on operating loss carryforwards |  | 461 |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 262 | 753 | 303 | 262 |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 39 | 78 |  | 141 |  |
Unrecognized tax benefits | 423 | 998 | 456 | 423 |  | $ 417
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 25 | 6 |  | 99 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 0 | 3 |  | 11 |  |
Unrecognized tax benefits, interest and penalties accrued | 110 | 146 | 122 | 110 |  |
Unrecognized tax benefits, interest and penalties | $ 8 | 16 |  | 8 |  |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense |  | 800 |  |  |  |
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 |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Tax credit carryforwards |  | 123 |  |  |  |
State and Local |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Tax credit carryforwards |  | 2,400 |  |  |  |
Foreign |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Tax credit carryforwards |  | 2,200 |  |  |  |
Patient Recovery Business [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  |  |  | 110 |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  |  | 81 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  |  |  | $ 11 |  |
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 |  | 19 | 22 |  |  |
CareFusion [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority |  | 176 | $ 165 |  |  |
Total Opioid Litigation [Member] |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Estimated Litigation Liability |  |  |  |  | $ 5,630 |
Income Tax Expense (Benefit) |  | (488) |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 469 |  |  |  |

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