FAIR VALUE MEASUREMENTS (Schedule of Maturities on Debt Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	$ 4,468	$ 4,291
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	28
1–5 years	694
5–10 years	435
More than 10 years	971
Total maturities of fixed-income securities	2,128	2,077
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	507	233
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	0
1–5 years	15
5–10 years	29
More than 10 years	65
Total maturities of fixed-income securities	$ 109	$ 113