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SHARE-BASED COMPENSATION - SHARE-BASED COMPENSATION EXPENSE/ OPTIONS (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Number of shares available for future grants (in shares) 6,927,284    
Number of shares authorized for issuance (in shares) 6,927,284    
Share-based compensation expense, before income taxes $ 62.0 $ 66.0 $ 76.0
Income tax benefit (17.0) (18.0) (21.0)
Share-based Payment Arrangement, Expense, after Tax 45.0 48.0 55.0
Capitalized share-based compensation cost 11.0 11.0 10.0
Excess income tax deficiency $ 19.0 $ 4.0 $ 15.0
Stock option exercise period (in years) 3 years    
Weighted-average fair value for options granted (in dollars per share) $ 19.76 $ 13.20  
Stock price volatility (as a percent) 18.78% 18.63%  
Expected term (in years) 5 years 4 months 2 days 5 years 4 months 2 days  
Risk-free rate of return (as a percent) 1.68% 2.49%  
Annual dividend yield (as a percent) 2.60% 3.35%  
Common shares under options      
Beginning balance (in shares) 247,577    
Options grants in period (in shares) 154,860 261,075 0
Exercised (in shares) (4,400) (52,540) (138,861)
Forfeited/canceled (in shares) (32,642)    
Ending balance (in shares) 365,395 247,577  
Vested at period end (in shares) 349,596    
Exercisable at period end (in shares) 81,061    
Weighted- average exercise price      
Beginning balance (in dollars per share) $ 105.86    
Granted (in dollars per share) 149.12    
Exercised (in dollars per share) 55.90    
Forfeited/canceled (in dollars per share) 149.12    
Ending balance (in dollars per share) 120.93 $ 105.86  
Vested at period end, Weighted- average exercise price (in dollars per share) 120.28    
Exercisable at period end, Weighted- average exercise price (in dollars per share) $ 106.76    
Outstanding at period end, Weighted- average remaining contractual term 8 years 4 months 2 days    
Vested at period end, Weighted- average remaining contractual term 8 years 3 months 25 days    
Exercisable at period end, Weighted- average remaining contractual term 8 years    
Outstanding at period end, Aggregate intrinsic value $ 2.0    
Vested at period end, Aggregate intrinsic value 2.0    
Exercisable at period end, Aggregate intrinsic value 2.0    
Aggregate intrinsic value of options exercised $ 0.4 $ 4.0 $ 9.0
Weighted average period over which unrecognized compensation cost will be recognized 1 year 3 months 18 days    
Weighted-average per share fair value for nonqualified stock options granted (in dollars per share)   $ 106.76  
Cash received from exercise of options $ 0.2 $ 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 11.0 10.0 12.0
Income tax benefit (3.0) (3.0) (3.0)
Share-based Payment Arrangement, Expense, after Tax 8.0 7.0 9.0
Capitalized share-based compensation cost 7.0 6.0 6.0
Excess income tax deficiency 3.0 1.0 3.0
Southern California Gas Company [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Share-based compensation expense, before income taxes 14.0 15.0 16.0
Income tax benefit (4.0) (4.0) (5.0)
Share-based Payment Arrangement, Expense, after Tax 10.0 11.0 11.0
Capitalized share-based compensation cost 4.0 5.0 4.0
Excess income tax deficiency $ 3.0 $ 1.0 $ 2.0
Share-based Payment Arrangement, Option [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Expiration period 10 years    
Awards Granted In 2020 and 2019 [Member] | Share-based Payment Arrangement, Option [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 3 years    
Awards Granted In 2010 and Prior [Member] | Share-based Payment Arrangement, Option [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 4 years    
Awarded during or after 2015 [Member] | Performance Shares [Member]      
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 [Member] | Performance Shares [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 4 years    
Awards Granted Prior to 2015 [Member] | Restricted Stock Units (RSUs), Service-based [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 4 years    
Awarded During Or After 2014 [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting rights maximum additional award 100.00%    
Awards Granted in 2019 [Member] | Restricted Stock Units (RSUs), Service-based [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 3 years    
Awards Granted During 2015 Through 2018 [Member] | Restricted Stock Units (RSUs), Service-based [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award vesting period 3 years    
Minimum [Member] | Restricted Stock Units (RSUs), Service-based [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award requisite service period 3 years    
Maximum [Member] | Restricted Stock Units (RSUs), Service-based [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Award requisite service period 4 years