v3.26.1
FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets:    
Price risk management instruments, netting $ (2) $ (52)
TOTAL ASSETS 8,520 8,274
Liabilities:    
Price risk management instruments, netting (30) (52)
TOTAL LIABILITIES 146 223
Amount primarily related to deferred taxes on appreciation of investment value 904 881
Self-insurance investments    
Assets:    
TOTAL ASSETS 1,000 1,000
Pacific Casualty Insurance Company, LLC    
Assets:    
TOTAL ASSETS 144 77
Short-term investments    
Assets:    
Short-term investments 850 634
Self-insurance investments    
Assets:    
Short-term investments 1,212 1,120
TOTAL ASSETS 1,212 1,120
Nuclear decommissioning trusts    
Assets:    
Short-term investments 37 94
Global equity securities 2,553 2,433
Fixed-income securities 2,716 2,558
Price risk management instruments, netting   0
TOTAL ASSETS 5,335 5,111
Customer credit trust    
Assets:    
Short-term investments 24 111
Global equity securities 0 0
Fixed-income securities 529 693
TOTAL ASSETS 553 804
Rabbi trusts    
Assets:    
Short-term investments 118 115
Global equity securities 5 5
Life insurance contracts 65 65
TOTAL ASSETS 188 185
Long-term disability trust    
Assets:    
Short-term investments 6 10
TOTAL ASSETS 119 137
Total price risk management instruments    
Assets:    
Price risk management instruments, netting (2) (52)
Price risk management instruments, assets 263 283
Electricity    
Assets:    
Price risk management instruments, netting 7 (6)
Price risk management instruments, assets 258 296
Liabilities:    
Price risk management instruments, netting (28) (6)
Price risk management instruments, liabilities 145 204
Gas    
Assets:    
Price risk management instruments, netting (9) (46)
Price risk management instruments, assets 5 (13)
Liabilities:    
Price risk management instruments, netting (2) (46)
Price risk management instruments, liabilities 1 19
Level 1    
Assets:    
TOTAL ASSETS 6,530 6,334
Liabilities:    
TOTAL LIABILITIES 0 0
Level 1 | Short-term investments    
Assets:    
Short-term investments 850 634
Level 1 | Self-insurance investments    
Assets:    
Short-term investments 1,212 1,120
TOTAL ASSETS 1,212 1,120
Level 1 | Nuclear decommissioning trusts    
Assets:    
Short-term investments 37 94
Global equity securities 2,553 2,433
Fixed-income securities 1,568 1,445
TOTAL ASSETS 4,158 3,972
Level 1 | Customer credit trust    
Assets:    
Short-term investments 24 111
Global equity securities 0
Fixed-income securities 157 367
TOTAL ASSETS 181 478
Level 1 | Rabbi trusts    
Assets:    
Short-term investments 118 115
Global equity securities 5 5
Life insurance contracts 0 0
TOTAL ASSETS 123 120
Level 1 | Long-term disability trust    
Assets:    
Short-term investments 6 10
TOTAL ASSETS 6 10
Level 1 | Total price risk management instruments    
Assets:    
Price risk management instruments, gross subject to netting 0 0
Level 1 | Electricity    
Assets:    
Price risk management instruments, gross subject to netting 0 0
Liabilities:    
Price risk management instruments, gross subject to netting 0 0
Level 1 | Gas    
Assets:    
Price risk management instruments, gross subject to netting 0 0
Liabilities:    
Price risk management instruments, gross subject to netting 0 0
Level 2    
Assets:    
TOTAL ASSETS 1,628 1,556
Liabilities:    
TOTAL LIABILITIES 32 145
Level 2 | Short-term investments    
Assets:    
Short-term investments 0 0
Level 2 | Self-insurance investments    
Assets:    
Short-term investments 0 0
TOTAL ASSETS 0 0
Level 2 | Nuclear decommissioning trusts    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Fixed-income securities 1,148 1,113
TOTAL ASSETS 1,148 1,113
Level 2 | Customer credit trust    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Fixed-income securities 372 326
TOTAL ASSETS 372 326
Level 2 | Rabbi trusts    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Life insurance contracts 65 65
TOTAL ASSETS 65 65
Level 2 | Long-term disability trust    
Assets:    
Short-term investments 0 0
TOTAL ASSETS 0 0
Level 2 | Total price risk management instruments    
Assets:    
Price risk management instruments, gross subject to netting 43 52
Level 2 | Electricity    
Assets:    
Price risk management instruments, gross subject to netting 29 19
Liabilities:    
Price risk management instruments, gross subject to netting 29 80
Level 2 | Gas    
Assets:    
Price risk management instruments, gross subject to netting 14 33
Liabilities:    
Price risk management instruments, gross subject to netting 3 65
Level 3    
Assets:    
TOTAL ASSETS 222 283
Liabilities:    
TOTAL LIABILITIES 144 130
Level 3 | Short-term investments    
Assets:    
Short-term investments 0 0
Level 3 | Self-insurance investments    
Assets:    
Short-term investments 0 0
TOTAL ASSETS 0 0
Level 3 | Nuclear decommissioning trusts    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Fixed-income securities 0 0
TOTAL ASSETS 0 0
Level 3 | Customer credit trust    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Fixed-income securities 0 0
TOTAL ASSETS 0 0
Level 3 | Rabbi trusts    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Life insurance contracts 0 0
TOTAL ASSETS 0 0
Level 3 | Long-term disability trust    
Assets:    
Short-term investments 0 0
TOTAL ASSETS 0 0
Level 3 | Total price risk management instruments    
Assets:    
Price risk management instruments, gross subject to netting 222 283
Level 3 | Electricity    
Assets:    
Price risk management instruments, gross subject to netting 222 283
Liabilities:    
Price risk management instruments, gross subject to netting 144 130
Level 3 | Gas    
Assets:    
Price risk management instruments, gross subject to netting 0 0
Liabilities:    
Price risk management instruments, gross subject to netting 0 0
Assets measured at NAV | Nuclear decommissioning trusts    
Assets:    
Assets measured at NAV 29 26
Assets measured at NAV | Long-term disability trust    
Assets:    
Assets measured at NAV $ 113 $ 127