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Derivatives (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Aggregate notional amount of interest rate swaps | $ 825,000,000 | $ 825,000,000
Face value of medium-term notes | $ 21,000,000 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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