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Long-term Debt - Recourse Debt (Details)	3 Months Ended
	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 CAD ($)	Jun. 30, 2020 USD ($)	Mar. 11, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Debt amount	$ 5,929,000,000					$ 6,042,000,000
Recourse Debt
Debt Instrument [Line Items]
Debt amount	5,925,000,000					6,008,000,000
Recourse Debt | Tax-exempt bonds
Debt Instrument [Line Items]
Debt amount	$ 466,000,000					466,000,000
Debt issuance amount					$ 59,000,000
Recourse Debt | Dunkirk Power LLC Tax Exempt Bonds Due 2042
Debt Instrument [Line Items]
Interest rate, stated percentage	5.875%		5.875%
Revolving Credit Facility | Line of Credit | Revolver Facility
Debt Instrument [Line Items]
Debt amount	$ 0					$ 83,000,000
Increase revolving commitments	802,000,000
Revolving credit commitments	$ 273,000,000
Debt term	30 months
Debt extension, term	12 months
Credit facility, lien basket (greater than)	$ 10,000,000,000			$ 6,000,000,000
Credit facilities, percentage of total assets	30.00%		30.00%	30.00%
Revolving Credit Facility | Line of Credit | Revolver Facility | Forecast
Debt Instrument [Line Items]
Total revolving commitments available		$ 3,700,000,000
Bridge Loan | Line of Credit
Debt Instrument [Line Items]
Revolving credit commitments	$ 100,000,000		$ 10,000,000	$ 50,000,000
Debt Basket | Revolver Facility
Debt Instrument [Line Items]
Revolving credit commitments	600,000,000
Debt Basket | Line of Credit
Debt Instrument [Line Items]
Revolving credit commitments	10,000,000,000			6,000,000,000
Debt Basket | Secured Debt | Revolver Facility
Debt Instrument [Line Items]
Revolving credit commitments	$ 1,700,000,000			$ 750,000,000

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