v3.26.3
FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Assets:    
Price risk management instruments, netting $ (12) $ (52)
TOTAL ASSETS 8,229 8,274
Liabilities:    
Price risk management instruments, netting (26) (52)
TOTAL LIABILITIES 141 223
Amount primarily related to deferred taxes on appreciation of investment value 825 881
Self-insurance investments    
Assets:    
TOTAL ASSETS 1,000 1,000
Pacific Casualty Insurance Company, LLC    
Assets:    
TOTAL ASSETS 167 77
Short-term investments    
Assets:    
Short-term investments 764 634
Self-insurance investments    
Assets:    
Short-term investments 1,243 1,120
TOTAL ASSETS 1,243 1,120
Nuclear decommissioning trusts    
Assets:    
Short-term investments 28 94
Global equity securities 2,528 2,433
Fixed-income securities 2,671 2,558
Price risk management instruments, netting   0
TOTAL ASSETS 5,257 5,111
Customer credit trust    
Assets:    
Short-term investments 20 111
Global equity securities 0 0
Fixed-income securities 388 693
TOTAL ASSETS 408 804
Rabbi trusts    
Assets:    
Short-term investments 119 115
Global equity securities 3 5
Life insurance contracts 65 65
TOTAL ASSETS 187 185
Long-term disability trust    
Assets:    
Short-term investments 7 10
TOTAL ASSETS 112 137
Total price risk management instruments    
Assets:    
Price risk management instruments, netting (12) (52)
Price risk management instruments, assets 258 283
Electricity    
Assets:    
Price risk management instruments, netting (7) (6)
Price risk management instruments, assets 256 296
Liabilities:    
Price risk management instruments, netting (20) (6)
Price risk management instruments, liabilities 139 204
Gas    
Assets:    
Price risk management instruments, netting (5) (46)
Price risk management instruments, assets 2 (13)
Liabilities:    
Price risk management instruments, netting (6) (46)
Price risk management instruments, liabilities 2 19
Level 1    
Assets:    
TOTAL ASSETS 6,337 6,334
Liabilities:    
TOTAL LIABILITIES 0 0
Level 1 | Short-term investments    
Assets:    
Short-term investments 764 634
Level 1 | Self-insurance investments    
Assets:    
Short-term investments 1,243 1,120
TOTAL ASSETS 1,243 1,120
Level 1 | Nuclear decommissioning trusts    
Assets:    
Short-term investments 28 94
Global equity securities 2,528 2,433
Fixed-income securities 1,507 1,445
TOTAL ASSETS 4,063 3,972
Level 1 | Customer credit trust    
Assets:    
Short-term investments 20 111
Global equity securities 0
Fixed-income securities 118 367
TOTAL ASSETS 138 478
Level 1 | Rabbi trusts    
Assets:    
Short-term investments 119 115
Global equity securities 3 5
Life insurance contracts 0 0
TOTAL ASSETS 122 120
Level 1 | Long-term disability trust    
Assets:    
Short-term investments 7 10
TOTAL ASSETS 7 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 1,546 1,556
Liabilities:    
TOTAL LIABILITIES 24 145
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 1,164 1,113
TOTAL ASSETS 1,164 1,113
Level 2 | Customer credit trust    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Fixed-income securities 270 326
TOTAL ASSETS 270 326
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 47 52
Level 2 | Electricity    
Assets:    
Price risk management instruments, gross subject to netting 40 19
Liabilities:    
Price risk management instruments, gross subject to netting 16 80
Level 2 | Gas    
Assets:    
Price risk management instruments, gross subject to netting 7 33
Liabilities:    
Price risk management instruments, gross subject to netting 8 65
Level 3    
Assets:    
TOTAL ASSETS 223 283
Liabilities:    
TOTAL LIABILITIES 143 130
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 223 283
Level 3 | Electricity    
Assets:    
Price risk management instruments, gross subject to netting 223 283
Liabilities:    
Price risk management instruments, gross subject to netting 143 130
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 30 26
Assets measured at NAV | Long-term disability trust    
Assets:    
Assets measured at NAV $ 105 $ 127