FAIR VALUE MEASUREMENTS (Schedule of Maturities on Debt Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	$ 4,291	$ 3,872
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	9
1–5 years	665
5–10 years	463
More than 10 years	940
Total maturities of fixed-income securities	2,077	1,885
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	233	745
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	0
1–5 years	25
5–10 years	29
More than 10 years	59
Total maturities of fixed-income securities	$ 113	$ 508