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Fair Value Measurements - Restricted Investments (Details) - TSG - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 05, 2020 | Nov. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Agreement period |  | 20 years |  |  |  |
Number of common shares received under agreement (in shares) | 0.2253 | 1,000,000 |  |  |  |
Common shares, sales restriction period, upon exercise of first option |  | 1 year |  |  |  |
Cumulative unrealized gains (losses) |  |  | $ 5 | $ (2) | $ 8 |
Marketable Securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value, total |  |  | 19 |  | 19 | $ 14
Cumulative unrealized gains (losses) |  |  |  |  | 9 | $ 4
Restricted Cash and Investments |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value, total |  |  | $ 8 |  | 8 |
Cumulative unrealized gains (losses) |  |  |  |  | $ 3 |

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