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Summary of Significant Accounting Policies ASU Pronouncement Impacts (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Subsequent Event [Member] | Retained Earnings [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 15

X
- Definition Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements. + References No definition available. + Details
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Period Type: | duration

X
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X
- Details
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X
- Details
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