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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Assets:    
Price risk management instruments, netting $ 1 $ (16)
Price risk management instruments, assets 386 403
TOTAL ASSETS 7,784 7,404
Liabilities:    
Price risk management instruments, netting (11) (16)
TOTAL LIABILITIES 198 303
Amount primarily related to deferred taxes on appreciation of investment value 809 747
Short-term investments    
Assets:    
Short-term investments 338 826
PERS    
Assets:    
Short-term investments 979 905
TOTAL ASSETS 979 905
Nuclear decommissioning trusts    
Assets:    
Short-term investments 46 53
Global equity securities 2,433 2,228
Fixed-income securities 2,328 2,277
TOTAL ASSETS 4,831 4,580
Customer credit trust    
Assets:    
Short-term investments 16 1
Global equity securities 473 186
Fixed-income securities 446 190
TOTAL ASSETS 935 377
Rabbi trusts    
Assets:    
Short-term investments 112 107
Global equity securities 4 6
Life insurance contracts 66 66
TOTAL ASSETS 182 179
Long-term disability trust    
Assets:    
Short-term investments 4 4
TOTAL ASSETS 133 134
Electricity    
Assets:    
Price risk management instruments, netting 3 (6)
Price risk management instruments, assets 363 403
Liabilities:    
Price risk management instruments, netting (5) (6)
Price risk management instruments, liabilities 195 279
Gas    
Assets:    
Price risk management instruments, netting (2) (10)
Price risk management instruments, assets 23 0
Liabilities:    
Price risk management instruments, netting (6) (10)
Price risk management instruments, liabilities 3 24
Level 1    
Assets:    
Price risk management instruments, gross subject to netting 0 0
TOTAL ASSETS 5,770 5,612
Liabilities:    
TOTAL LIABILITIES 0 0
Level 1 | Short-term investments    
Assets:    
Short-term investments 338 826
Level 1 | PERS    
Assets:    
Short-term investments 979 905
TOTAL ASSETS 979 905
Level 1 | Nuclear decommissioning trusts    
Assets:    
Short-term investments 46 53
Global equity securities 2,433 2,228
Fixed-income securities 1,277 1,250
TOTAL ASSETS 3,756 3,531
Level 1 | Customer credit trust    
Assets:    
Short-term investments 16 1
Global equity securities 473 186
Fixed-income securities 88 46
TOTAL ASSETS 577 233
Level 1 | Rabbi trusts    
Assets:    
Short-term investments 112 107
Global equity securities 4 6
Life insurance contracts 0 0
TOTAL ASSETS 116 113
Level 1 | Long-term disability trust    
Assets:    
Short-term investments 4 4
TOTAL ASSETS 4 4
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 73 36
TOTAL ASSETS 1,548 1,273
Liabilities:    
TOTAL LIABILITIES 33 71
Level 2 | Short-term investments    
Assets:    
Short-term investments 0 0
Level 2 | PERS    
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 1,051 1,027
TOTAL ASSETS 1,051 1,027
Level 2 | Customer credit trust    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Fixed-income securities 358 144
TOTAL ASSETS 358 144
Level 2 | Rabbi trusts    
Assets:    
Short-term investments 0 0
Global equity securities 0 0
Life insurance contracts 66 66
TOTAL ASSETS 66 66
Level 2 | Long-term disability trust    
Assets:    
Short-term investments 0 0
TOTAL ASSETS 0 0
Level 2 | Electricity    
Assets:    
Price risk management instruments, gross subject to netting 48 26
Liabilities:    
Price risk management instruments, gross subject to netting 24 37
Level 2 | Gas    
Assets:    
Price risk management instruments, gross subject to netting 25 10
Liabilities:    
Price risk management instruments, gross subject to netting 9 34
Level 3    
Assets:    
Price risk management instruments, gross subject to netting 312 383
TOTAL ASSETS 312 383
Liabilities:    
TOTAL LIABILITIES 176 248
Level 3 | Short-term investments    
Assets:    
Short-term investments 0 0
Level 3 | PERS    
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 | Electricity    
Assets:    
Price risk management instruments, gross subject to netting 312 383
Liabilities:    
Price risk management instruments, gross subject to netting 176 248
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 24 22
Assets measured at NAV | Long-term disability trust    
Assets:    
Assets measured at NAV $ 129 $ 130