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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Income Taxes |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | 22.10% | 213.80% | 32.70% |
Effective Tax Rate Impact From Certain Foreign Jurisdictions |  | $ 40 |  |  |
Provision at Federal statutory rate |  | 21.00% | 28.10% | 35.00% |
Federal |  | $ 28 | $ 1,003 | $ (258) |
Deferred tax assets on tax credit carryforwards | $ (526) | (621) | (526) |  |
Valuation allowance on operating loss carryforwards |  | 524 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 262 | 303 | 262 | 268 |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 141 | 39 |  | 23 |
Unrecognized tax benefits | 423 | 456 | 423 | 417 | $ 527
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 99 | 25 |  | 154 |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 11 | 0 |  | 0 |
Unrecognized tax benefits, interest and penalties accrued | 110 | 122 | 110 | 99 |
Unrecognized tax benefits, interest and penalties | 8 | 8 |  | $ 12 |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense |  | 780 | 309 |  |
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 |  | 15 |  |  |
Federal |  |  |  |  |
Income Taxes |  |  |  |  |
Tax credit carryforwards |  | 463 |  |  |
State and Local |  |  |  |  |
Income Taxes |  |  |  |  |
Tax credit carryforwards |  | 2,700 |  |  |
Foreign |  |  |  |  |
Income Taxes |  |  |  |  |
Tax credit carryforwards |  | 1,900 |  |  |
CareFusion [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority | 151 | 165 | 151 |  |
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 | $ 21 | $ 22 | $ 21 |  |

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