FAIR VALUE MEASUREMENTS (Schedule of Maturities on Debt Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Nuclear decommissioning trusts
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	$ 5,039	$ 5,111
Nuclear decommissioning trusts | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	58
1–5 years	904
5–10 years	592
More than 10 years	1,071
Total maturities of fixed-income securities	2,625	2,558
Customer credit trust
Debt Securities, Available-for-sale [Line Items]
Total maturities of fixed-income securities	691	804
Customer credit trust | Fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Less than 1 year	22
1–5 years	354
5–10 years	51
More than 10 years	137
Total maturities of fixed-income securities	$ 564	$ 693