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Debt Obligations (2014 Credit Facility) (Details) - Revolving Credit Facility - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Mar. 31, 2017 | Nov. 30, 2014
$750 million revolving credit commitment due November 25, 2019 (average interest rate of 0.00% for the period January 1, 2017 through March 31, 2017) |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, borrowing capacity |  | $ 750,000,000 | $ 750,000,000
Credit facility, proceeds |  | $ 0 |
$1 billion, five-year revolving credit facility | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, borrowing capacity | $ 1,000,000,000 |  |
Credit facility term | 5 years |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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