FAIR VALUE MEASUREMENTS (Schedule of Maturities on Debt Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	$ 5,050	$ 4,580
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	124
1–5 years	726
5–10 years	594
More than 10 years	1,054
Total maturities of fixed-income securities	2,498	2,277
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	902	377
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	1
1–5 years	132
5–10 years	49
More than 10 years	262
Total maturities of fixed-income securities	$ 444	$ 190