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Subsequent Events Subsequent Events (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 19, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2017
Subsequent Event [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 89.00% | 89.00%
Restructuring Charges |  |  | $ 6 | $ 7
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 51.00% |  |  |
Payments to Acquire Businesses, Gross | $ 10 |  |  |
Minimum [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Restructuring Charges |  | $ 80 |  |
Maximum [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Restructuring Charges |  | $ 100 |  |

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