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Debt - Senior Notes (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 19, 2019 | May 23, 2019 | Jan. 15, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
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) | $ (6,000,000) | $ 0 |  |  |
Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt repaid |  | 265,000,000 |  |  |  |  |
Senior Note Two Point Eight due in Two Thousand Twenty Nine [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) | 2000.00% |  |  |  |  |  |
Senior Note Three Point Six due in Two Thousand Forty Nine [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) | 2500.00% |  |  |  |  |  |
Senior Note Five Point One Twenty Five due in Two Thousand Twenty Two [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt repaid |  | $ 800 |  |  |  |  |
Senior Notes | Senior Note Six Point Zero Percent Due in Two Thousand Nineteen [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  |  | $ 413,000,000
Senior Notes | Senior Note Two Point Eight due in Two Thousand Twenty Nine [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 600,000,000 |  |
Senior Notes | Senior Note Three Point Six due in Two Thousand Forty Nine [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 800,000,000 |  |
Par Value [Member] | Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  | $ 265,000,000 |
Fair Value [Member] | Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  | $ 284,000,000 |

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