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Long-term Debt and Finance Leases - Tax Exempt Bonds (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt	$ 10,940	$ 8,100
NRG Indian River Power 2020, tax exempt bonds, due 2040
Debt Instrument [Line Items]
Long-term debt	$ 57	57
Interest rate, stated percentage	1.25%
NRG Indian River Power 2020, tax exempt bonds, due 2045
Debt Instrument [Line Items]
Long-term debt	$ 190	190
Interest rate, stated percentage	1.25%
NRG Dunkirk 2020, tax exempt bonds, due 2042
Debt Instrument [Line Items]
Long-term debt	$ 59	59
Interest rate, stated percentage	4.25%
City of Texas City, tax exempt bonds, due 2045
Debt Instrument [Line Items]
Long-term debt	$ 33	33
Interest rate, stated percentage	4.125%
Fort Bend County, tax exempt bonds, due 2038
Debt Instrument [Line Items]
Long-term debt	$ 54	54
Interest rate, stated percentage	4.75%
Fort Bend County, tax exempt bonds, due 2042
Debt Instrument [Line Items]
Long-term debt	$ 73	73
Interest rate, stated percentage	4.75%
Tax-exempt bonds
Debt Instrument [Line Items]
Long-term debt	$ 466	$ 466

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