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SHARE-BASED COMPENSATION - SHARE-BASED COMPENSATION EXPENSE/ OPTIONS (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Number of shares available for future grants (in shares) 5,986,241    
Number of shares authorized for issuance (in shares) 5,986,241    
Share-based compensation expense, before income taxes $ 58.0 $ 62.0 $ 66.0
Income tax benefit (16.0) (17.0) (18.0)
Share-based Payment Arrangement, Expense, after Tax 42.0 45.0 48.0
Capitalized share-based compensation cost 9.0 11.0 11.0
Excess income tax (benefit) deficiency $ (9.0) $ (19.0) $ 4.0
Stock option exercise period (in years) 3 years    
Weighted-average fair value for options granted (in dollars per share) $ 19.07 $ 19.76 $ 13.20
Stock price volatility (as a percent) 26.57% 18.78% 18.63%
Expected term (in years) 5 years 4 months 9 days 5 years 4 months 2 days 5 years 4 months 2 days
Risk-free rate of return (as a percent) 0.41% 1.68% 2.49%
Annual dividend yield (as a percent) 3.38% 2.60% 3.35%
Common shares under options      
Beginning balance (in shares) 365,395    
Options grants in period (in shares) 222,620 154,860 261,075
Exercised (in shares) (50,671) (4,400) (52,540)
Ending balance (in shares) 537,344 365,395  
Vested at period end (in shares) 537,344    
Exercisable at period end (in shares) 152,189    
Weighted- average exercise price      
Beginning balance (in dollars per share) $ 120.93    
Granted (in dollars per share) 123.80    
Exercised (in dollars per share) 106.76    
Ending balance (in dollars per share) 123.45 $ 120.93  
Vested at period end, Weighted- average exercise price (in dollars per share) 123.45    
Exercisable at period end, Weighted- average exercise price (in dollars per share) $ 118.10    
Outstanding at period end, Weighted- average remaining contractual term 8 years 21 days    
Vested at period end, Weighted- average remaining contractual term 8 years 21 days    
Exercisable at period end, Weighted- average remaining contractual term 7 years 3 months 7 days    
Outstanding at period end, Aggregate intrinsic value $ 5.0    
Vested at period end, Aggregate intrinsic value 5.0    
Exercisable at period end, Aggregate intrinsic value 2.0    
Aggregate intrinsic value of options exercised $ 1.4 $ 0.4 $ 4.0
Weighted average period over which unrecognized compensation cost will be recognized 1 year 1 month 6 days    
Weighted-average per share fair value for nonqualified stock options granted (in dollars per share)   $ 149.12 $ 106.76
Cash received from exercise of options $ 5.0   $ 3.0
San Diego Gas and Electric Company [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based compensation expense, before income taxes 10.0 $ 11.0 10.0
Income tax benefit (3.0) (3.0) (3.0)
Share-based Payment Arrangement, Expense, after Tax 7.0 8.0 7.0
Capitalized share-based compensation cost 5.0 7.0 6.0
Excess income tax (benefit) deficiency (1.0) (3.0) 1.0
SoCalGas      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based compensation expense, before income taxes 14.0 14.0 15.0
Income tax benefit (4.0) (4.0) (4.0)
Share-based Payment Arrangement, Expense, after Tax 10.0 10.0 11.0
Capitalized share-based compensation cost 4.0 4.0 5.0
Excess income tax (benefit) deficiency $ (1.0) $ (3.0) $ 1.0
Share-based Payment Arrangement, Option      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Expiration period 10 years    
Awards Granted In 2020 and 2019 | Share-based Payment Arrangement, Option      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 3 years    
Awarded during or after 2015 | Performance Shares      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 3 years    
Award vesting rights maximum additional award 100.00%    
Award vesting rights, Increase modifier for top quartile 20.00%    
Award vesting rights, decrease modifier for bottom quartile 20.00%    
Awards Granted Prior to 2015 | Restricted Stock Units (RSUs), Service-based      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 4 years    
Awarded During Or After 2014      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting rights maximum additional award 100.00%    
Awards Granted in 2019 | Restricted Stock Units (RSUs), Service-based      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 3 years    
Awards Granted During 2015 Through 2018 | Restricted Stock Units (RSUs), Service-based      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 3 years    
Minimum | Restricted Stock Units (RSUs), Service-based      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award requisite service period 3 years    
Maximum | Restricted Stock Units (RSUs), Service-based      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award requisite service period 4 years