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Summary of Significant Accounting Policies (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 reportable_segment | Jun. 30, 2016 reportable_segment | Mar. 31, 2017 USD ($)
Accounting Policies [Abstract] |  |  |
Number of reportable segments | reportable_segment | 4 | 5 |
Accounting Standards Update 2017-05 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Investment ownership percentage |  |  | 40.00%
Retained equity investment at estimated fair value | $ |  |  | $ 107

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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