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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held for sale | $ 2,216 | $ 0 |
Liabilities related to assets held for sale | 1,339 | 0 |
Assets: |  |  |
Total available-for-sale securities |  |  | $ 65
Recurring |  |  |
Assets: |  |  |
Cash equivalents | 0 | 739 |
Forward contracts | (33) | (21) |
Total available-for-sale securities | 0 | 65 |
Other investments | 122 | 116 |
Liabilities: |  |  |
Contingent Consideration | (21) | (32) |
Recurring | Level 1 |  |  |
Assets: |  |  |
Cash equivalents | 0 | 739 |
Forward contracts | 0 | 0 |
Total available-for-sale securities | 0 | 0 |
Other investments | 122 | 116 |
Liabilities: |  |  |
Contingent Consideration | 0 | 0 |
Recurring | Level 2 |  |  |
Assets: |  |  |
Cash equivalents | 0 | 0 |
Forward contracts | (33) | (21) |
Total available-for-sale securities | 0 | 65 |
Other investments | 0 | 0 |
Liabilities: |  |  |
Contingent Consideration | 0 | 0 |
Recurring | Level 3 |  |  |
Assets: |  |  |
Cash equivalents | 0 | 0 |
Forward contracts | 0 | 0 |
Total available-for-sale securities | 0 | 0 |
Other investments | 0 | 0 |
Liabilities: |  |  |
Contingent Consideration |  | $ (32) |
Disposal Group, Held-for-sale, Not Discontinued Operations | China Business |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held for sale | 2,216 |  |
Liabilities related to assets held for sale | $ 1,339 |  |

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