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Significant Accounting Policies Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 segment | Mar. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Number of reportable segments | segment | 3 |
ASU 2016-16 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of new accounting pronouncement | $ |  | $ 152

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- Details
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