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Long-term Debt - Recourse Debt (Details) - USD ($)	Jun. 30, 2020	Mar. 11, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt amount	$ 5,957,000,000		$ 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%
Revolving Credit Facility | Line of Credit | Revolver Facility
Debt Instrument [Line Items]
Debt amount	$ 0		$ 83,000,000

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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