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Fair Value of Financial Instruments and Risk Management (Carrying Value and Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Carrying Value | Secured Debt | Term Loan A |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | $ 281 | $ 285
Carrying Value | Secured Debt | Term Loan B |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 514 | 516
Carrying Value | Convertible Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 350 | 350
Carrying Value | Senior Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 250 | 250
Carrying Value | Senior Credit Facility | Revolving Credit Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 260 | 260
Carrying Value | Nonrecourse project debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 2 | 7
Fair Value | Secured Debt | Term Loan A |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 281 | 285
Fair Value | Secured Debt | Term Loan B |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 513 | 517
Fair Value | Convertible Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 543 | 480
Fair Value | Senior Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 251 | 262
Fair Value | Senior Credit Facility | Revolving Credit Facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | 260 | 260
Fair Value | Nonrecourse project debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | $ 2 | $ 7

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