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Debt - Corporate Credit Facility (Details) - Credit Facilities - Revolving Credit Facility - JPMorgan Chase Bank, N.A. |  | 12 Months Ended
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Jan. 10, 2017 USD ($) extension | Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items] |  |
Maximum principal amount of credit facility | $ 1,000,000,000.0 |
Number of extension options | extension | 2 |
Extension term | 6 months |
Extension commitment fee | 0.10% |
Maximum amount available for draw |  | $ 1,000,000,000.0
Percentage of unused amount |  | 0.35%
Minimum |  |
Line of Credit Facility [Line Items] |  |
Percentage of unused amount |  | 0.25%
Maximum |  |
Line of Credit Facility [Line Items] |  |
Percentage of unused amount |  | 0.35%
LIBOR |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate, percent |  | 2.25%
Base Rate |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate, percent |  | 1.25%
Accordion Feature |  |
Line of Credit Facility [Line Items] |  |
Maximum principal amount increase | $ 1,500,000,000.0 |

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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