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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018
Income Taxes |  |  |  |  |  |  |
Remeasurement Deferred Tax Assets and Liabilities expense (benefit) |  | $ 935 |  |  |  |  |
Foreign income, transition tax |  | $ 41 |  |  |  |  |
Effective income tax rate reconciliation |  | (231.90%) |  | 34.00% | (136.60%) | 35.60% |
Deferred tax asset adjustment, income tax expense (benefit) |  | $ 935 |  |  |  |  |
Unrecognized tax benefits |  | 520 | $ 417 |  | $ 520 |  |
Unrecognized tax benefits that would impact effective tax rate |  | 277 | 268 |  | 277 |  |
Unrecognized tax benefits, interest and penalties accrued |  | 125 | 99 |  | 125 |  |
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority |  | 146 | $ 142 |  | 146 |  |
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 |  | $ 30 |  |  | 30 |  |
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 |  | $ 136 |  |  | $ 136 |  |
Patient Recovery Business | Subsequent Event |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Business Combination, Indemnification Receivable Payment | $ 85 |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | China Business |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Provisional tax expense, disposal group |  | $ 57 |  |  |  |  |

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