FAIR VALUE MEASUREMENTS (Schedule of Maturities on Debt Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	$ 4,178	$ 3,872
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	22
1–5 years	627
5–10 years	497
More than 10 years	842
Total maturities of fixed-income securities	1,988	1,885
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	476	745
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	0
1–5 years	88
5–10 years	80
More than 10 years	153
Total maturities of fixed-income securities	$ 321	$ 508