FAIR VALUE MEASUREMENTS (Schedule of Maturities on Debt Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	$ 4,734	$ 4,291
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	46
1–5 years	767
5–10 years	511
More than 10 years	999
Total maturities of fixed-income securities	2,323	2,077
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	446	233
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	0
1–5 years	59
5–10 years	45
More than 10 years	114
Total maturities of fixed-income securities	$ 218	$ 113