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Equities Preferred Stock (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Feb. 28, 2017
Class of Stock [Line Items] |  |
Shelf Registration Effectiveness Period |  | 3 years
Class B Preferred Stock [Member] |  |
Class of Stock [Line Items] |  |
Preferred stock, Value registered | $ 2,000.0 |
Preferred stock, Value available for issuance |  | $ 990.0

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- Definition Preferred stock, Value available for issuance + References No definition available. + Details
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Period Type: | duration

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- Definition Preferred stock, Value registered + References No definition available. + Details
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- Definition Shelf Registration Effectiveness Period + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |