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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments $ 289 $ 470
Total nuclear decommissioning trusts 4,581 4,209
Rabbi trusts 180 185
Long-term disability trust 138 167
Netting 143 115
TOTAL ASSETS 5,558 5,315
Netting (27) (25)
Amount primarily related to deferred taxes on appreciation of investment value 783 671
Electric    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Netting 6 2
Netting (24) (25)
Gas    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Netting 137 113
Netting (3) 0
Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 22 27
Long-term disability trust 6 9
Global equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 2,504 2,398
Fixed-income securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 2,024 1,759
Rabbi trusts 104 106
Price risk management instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 370 284
TOTAL LIABILITIES 242 217
Price risk management instruments | Electric    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 229 170
TOTAL LIABILITIES 235 214
Price risk management instruments | Gas    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 141 114
TOTAL LIABILITIES 7 3
Life insurance contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Rabbi trusts 76 79
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 289 470
Total nuclear decommissioning trusts 3,684 3,349
Rabbi trusts 0 0
Long-term disability trust 6 9
TOTAL ASSETS 3,979 3,828
Level 1 | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 22 27
Long-term disability trust 6 9
Level 1 | Global equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 2,504 2,398
Level 1 | Fixed-income securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 1,158 924
Rabbi trusts 0 0
Level 1 | Price risk management instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 0 0
TOTAL LIABILITIES 0 0
Level 1 | Price risk management instruments | Electric    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 0 0
TOTAL LIABILITIES 0 0
Level 1 | Price risk management instruments | Gas    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 0 0
TOTAL LIABILITIES 0 0
Level 1 | Life insurance contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Rabbi trusts 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0 0
Total nuclear decommissioning trusts 866 835
Rabbi trusts 180 185
Long-term disability trust 0 0
TOTAL ASSETS 1,059 1,023
Level 2 | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 0 0
Long-term disability trust 0 0
Level 2 | Global equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 0 0
Level 2 | Fixed-income securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 866 835
Rabbi trusts 104 106
Level 2 | Price risk management instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 13 3
TOTAL LIABILITIES 21 4
Level 2 | Price risk management instruments | Electric    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 9 2
TOTAL LIABILITIES 11 1
Level 2 | Price risk management instruments | Gas    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 4 1
TOTAL LIABILITIES 10 3
Level 2 | Life insurance contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Rabbi trusts 76 79
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0 0
Total nuclear decommissioning trusts 0 0
Rabbi trusts 0 0
Long-term disability trust 0 0
TOTAL ASSETS 214 166
Level 3 | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 0 0
Long-term disability trust 0 0
Level 3 | Global equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 0 0
Level 3 | Fixed-income securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 0 0
Rabbi trusts 0 0
Level 3 | Price risk management instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 214 166
TOTAL LIABILITIES 248 238
Level 3 | Price risk management instruments | Electric    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 214 166
TOTAL LIABILITIES 248 238
Level 3 | Price risk management instruments | Gas    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total price risk management instruments 0 0
TOTAL LIABILITIES 0 0
Level 3 | Life insurance contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Rabbi trusts 0 0
Assets measured at NAV    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total nuclear decommissioning trusts 31 25
Long-term disability trust $ 132 $ 158