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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2018
Income Taxes |  |  |  |  |  |
Remeasurement Deferred Tax Assets and Liabilities expense (benefit) | $ 18 |  |  |  |  |
Foreign income, transition tax |  |  |  | $ 41 |  |
Unrecognized tax benefits | 426 | $ 417 |  | 426 |  |
Unrecognized tax benefits that would impact effective tax rate | 264 | 268 |  | 264 |  |
Unrecognized tax benefits, interest and penalties accrued | 106 | 99 |  | 106 |  |
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority | $ 148 | $ 142 |  | $ 148 |  |
Effective Income Tax Rate Reconciliation, Percent | 45.10% |  | 32.30% | (48.60%) | 34.40% |
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount | $ 18 |  | $ 31 |  |  |
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit) | (18) |  |  | $ (952) |  |
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 | $ 35 |  |  | 35 |  |
Federal | Minimum |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Closed tax year |  | 2006 |  |  |  |
Tax years open for examination | 2008 |  |  |  |  |
Federal | Maximum |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Closed tax year |  | 2007 |  |  |  |
Tax years open for examination |  | 2018 |  |  |  |
State and Local | Minimum |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Tax years open for examination | 2008 |  |  |  |  |
State and Local | Maximum |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Tax years open for examination |  | 2018 |  |  |  |
Foreign | Minimum |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Tax years open for examination | 2008 |  |  |  |  |
Foreign | Maximum |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Tax years open for examination |  | 2018 |  |  |  |
Scenario, Forecast |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Federal statutory rate |  |  |  |  |  | 28.10%
Patient Recovery Business |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Business Combination, Indemnification Receivable | $ 34 |  |  | 34 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | China Business |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Provisional tax expense, disposal group |  |  |  | $ 57 |  |

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