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Debt - Debt (Details) £ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2019 | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 AUD ($) | Sep. 30, 2019 GBP (£) | Aug. 19, 2019 USD ($) | May 23, 2019 USD ($) | Jan. 15, 2019 USD ($)
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Registration Payment Arrangement, Term | three |  |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs |  |  |  | $ 1,380,000,000 |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  | 100.00% |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 90,000,000 | $ 0 | $ 90,000,000 | $ 6,000,000 |  |  |  |  |
Club Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | 165,000,000 |  | 165,000,000 |  |  | £ 60 |  |  |
Bilateral Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | 8,000,000 |  | 8,000,000 |  |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  | 17,000,000 |  | $ 17,000,000 |  |  |  |  |  |
Australian Dollar Facility [Member] [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  | $ 24 |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  |  | $ 26 |  |  |  |
Senior Note Two Point Eight due in Two Thousand Twenty Nine [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  |  | 2000.00% |  |  |  |  |  |
Senior Note Three Point Six due in Two Thousand Forty Nine [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  |  | 2500.00% |  |  |  |  |  |
Senior Notes | Senior Note Six Point Zero Percent Due in Two Thousand Nineteen [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  |  | $ 413,000,000
Interest rate |  |  |  |  |  |  |  |  |  | 6.00%
Senior Notes | Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 5.75% |
Senior Notes |  |  |  |  |  |  |  |  | $ 265,000,000 |
Debt Instrument, Fair Value Disclosure |  |  |  |  |  |  |  |  | $ 284,000,000 |
Senior Notes | Senior Note Two Point Eight due in Two Thousand Twenty Nine [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 2.80% |  |
Senior Notes |  |  |  |  |  |  |  | $ 600,000,000 |  |
Senior Notes | Senior Note Three Point Six due in Two Thousand Forty Nine [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 3.60% |  |
Senior Notes |  |  |  |  |  |  |  | $ 800,000,000 |  |
Senior Notes | Senior Note Five Point Seven Five due in Two Thousand Twenty Three [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of debt |  | $ 265 |  | $ 265 |  |  |  |  |  |
Interest rate |  | 5.75% |  | 5.75% |  | 5.75% | 5.75% |  |  |
Senior Notes | Senior Note Five Point One Twenty Five due in Two Thousand Twenty Two [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of debt |  | $ 800 |  | $ 800 |  |  |  |  |  |
Interest rate |  | 5.125% |  | 5.125% |  | 5.125% | 5.125% |  |  |

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