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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Price risk management instruments, netting $ (19) $ (16)
Price risk management instruments, assets 330  
TOTAL ASSETS 7,957 7,404
Liabilities:    
Price risk management instruments, netting (22) (16)
TOTAL LIABILITIES 251 303
Amount primarily related to deferred taxes on appreciation of investment value 860 747
Self-insurance investments    
Assets:    
TOTAL ASSETS 1,000  
Pacific Casualty Insurance Company, LLC    
Assets:    
TOTAL ASSETS 76  
Short-term investments    
Assets:    
Short-term investments 285 826
Self-insurance investments    
Assets:    
Short-term investments 1,092 905
TOTAL ASSETS 1,092 905
Nuclear decommissioning trusts    
Assets:    
Short-term investments 34 53
Global equity securities 2,492 2,228
Fixed-income securities 2,498 2,277
Price risk management instruments, netting   0
TOTAL ASSETS 5,050 4,580
Customer credit trust    
Assets:    
Short-term investments 8 1
Global equity securities 450 186
Fixed-income securities 444 190
TOTAL ASSETS 902 377
Rabbi trusts    
Assets:    
Short-term investments 114 107
Global equity securities 4 6
Life insurance contracts 65 66
TOTAL ASSETS 183 179
Long-term disability trust    
Assets:    
Short-term investments 3 4
TOTAL ASSETS 115 134
Total price risk management instruments    
Assets:    
Price risk management instruments, netting   (16)
Price risk management instruments, assets   403
Electricity    
Assets:    
Price risk management instruments, netting (7) (6)
Price risk management instruments, assets 326 403
Liabilities:    
Price risk management instruments, netting (9) (6)
Price risk management instruments, liabilities 244 279
Gas    
Assets:    
Price risk management instruments, netting (12) (10)
Price risk management instruments, assets 4 0
Liabilities:    
Price risk management instruments, netting (13) (10)
Price risk management instruments, liabilities 7 24
Level 1    
Assets:    
Price risk management instruments, gross subject to netting 0  
TOTAL ASSETS 5,956 5,612
Liabilities:    
TOTAL LIABILITIES 0 0
Level 1 | Short-term investments    
Assets:    
Short-term investments 285 826
Level 1 | Self-insurance investments    
Assets:    
Short-term investments 1,092 905
TOTAL ASSETS 1,092 905
Level 1 | Nuclear decommissioning trusts    
Assets:    
Short-term investments 34 53
Global equity securities 2,492 2,228
Fixed-income securities 1,376 1,250
TOTAL ASSETS 3,902 3,531
Level 1 | Customer credit trust    
Assets:    
Short-term investments 8 1
Global equity securities 450 186
Fixed-income securities 98 46
TOTAL ASSETS 556 233
Level 1 | Rabbi trusts    
Assets:    
Short-term investments 114 107
Global equity securities 4 6
Life insurance contracts 0 0
TOTAL ASSETS 118 113
Level 1 | Long-term disability trust    
Assets:    
Short-term investments 3 4
TOTAL ASSETS 3 4
Level 1 | Total price risk management instruments    
Assets:    
Price risk management instruments, gross subject to netting   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:    
Price risk management instruments, gross subject to netting 28  
TOTAL ASSETS 1,561 1,273
Liabilities:    
TOTAL LIABILITIES 88 71
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 1,122 1,027
TOTAL ASSETS 1,122 1,027
Level 2 | Customer credit trust    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Fixed-income securities 346 144
TOTAL ASSETS 346 144
Level 2 | Rabbi trusts    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Life insurance contracts 65 66
TOTAL ASSETS 65 66
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   36
Level 2 | Electricity    
Assets:    
Price risk management instruments, gross subject to netting 12 26
Liabilities:    
Price risk management instruments, gross subject to netting 68 37
Level 2 | Gas    
Assets:    
Price risk management instruments, gross subject to netting 16 10
Liabilities:    
Price risk management instruments, gross subject to netting 20 34
Level 3    
Assets:    
Price risk management instruments, gross subject to netting 321  
TOTAL ASSETS 321 383
Liabilities:    
TOTAL LIABILITIES 185 248
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   383
Level 3 | Electricity    
Assets:    
Price risk management instruments, gross subject to netting 321 383
Liabilities:    
Price risk management instruments, gross subject to netting 185 248
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 26 22
Assets measured at NAV | Long-term disability trust    
Assets:    
Assets measured at NAV $ 112 $ 130