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Debt - Debt (Details) £ in Millions, $ in Millions | Mar. 31, 2020 USD ($) | Mar. 31, 2020 GBP (£) | Mar. 30, 2020 USD ($)
--- | --- | --- | ---
Club Facility [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Letters of Credit Outstanding, Amount | $ 165 | £ 60 |
Bilateral Facility [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Letters of Credit Outstanding, Amount | 18 |  |
Debt Instrument, Unused Borrowing Capacity, Amount | $ 3 |  |
Senior Notes | Senior Note Six Point Zero Percent Due in Two Thousand Nineteen [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Repayment of debt |  |  | $ 500

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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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