SHARE-BASED COMPENSATION - SHARE-BASED COMPENSATION EXPENSE/ OPTIONS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares available for future grants (in shares)	8,918,154
Number of shares authorized for issuance (in shares)	8,918,154
Share-based compensation expense, before income taxes	$ 71,000,000	$ 61,000,000	$ 58,000,000
Income tax benefit	(9,000,000)	(17,000,000)	(16,000,000)
Share-based Payment Arrangement, Expense, after Tax	62,000,000	44,000,000	42,000,000
Capitalized share-based compensation cost	12,000,000	11,000,000	9,000,000
Excess income tax (benefit) deficiency	$ (6,000,000)	$ (3,000,000)	$ (9,000,000)
Non-qualified stock options granted (in shares)	326,574	439,796	445,240
Stock option exercise period (in years)	3 years
Weighted-average fair value for options granted (in dollars per share)	$ 17.50	$ 10.99	$ 9.54
Stock price volatility (as a percent)	27.35%	26.08%	26.57%
Expected term (in years)	5 years 4 months 9 days	5 years 4 months 9 days	5 years 4 months 9 days
Risk-free rate of return (as a percent)	3.89%	1.40%	0.41%
Annual dividend yield (as a percent)	2.98%	3.33%	3.38%
Common shares under options
Beginning balance (in shares)	1,433,224
Options granted in period (in shares)	326,574	439,796	445,240
Ending balance (in shares)	1,759,798	1,433,224
Vested at period end (in shares)	1,759,798
Exercisable at period end (in shares)	991,618
Weighted- average exercise price
Beginning balance (in dollars per share)	$ 63.51
Granted (in dollars per share)	76.86
Ending balance (in dollars per share)	65.99	$ 63.51
Vested at period end, Weighted- average exercise price (in dollars per share)	65.99
Exercisable at period end, Weighted- average exercise price (in dollars per share)	$ 63.02
Outstanding at period end, Weighted- average remaining contractual term	7 years 1 month 20 days
Vested at period end, Weighted- average remaining contractual term	7 years 1 month 20 days
Exercisable at period end, Weighted- average remaining contractual term	6 years 3 months 18 days
Outstanding at period end, Aggregate intrinsic value	$ 15,000,000
Vested at period end, Aggregate intrinsic value	15,000,000
Exercisable at period end, Aggregate intrinsic value	12,000,000
Aggregate intrinsic value of options exercised	0	$ 1,700,000	$ 1,400,000
Weighted-average per share fair value for nonqualified stock options granted (in dollars per share)		$ 66.00	$ 61.90
Cash received from exercise of options		$ 4,000,000	$ 5,000,000
SDG&E
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense, before income taxes	13,000,000	11,000,000	10,000,000
Income tax benefit	(2,000,000)	(3,000,000)	(3,000,000)
Share-based Payment Arrangement, Expense, after Tax	11,000,000	8,000,000	7,000,000
Capitalized share-based compensation cost	7,000,000	6,000,000	5,000,000
Excess income tax (benefit) deficiency	(1,000,000)	0	(1,000,000)
SoCalGas
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense, before income taxes	18,000,000	17,000,000	14,000,000
Income tax benefit	(3,000,000)	(5,000,000)	(4,000,000)
Share-based Payment Arrangement, Expense, after Tax	15,000,000	12,000,000	10,000,000
Capitalized share-based compensation cost	5,000,000	5,000,000	4,000,000
Excess income tax (benefit) deficiency	$ (1,000,000)	$ 0	$ (1,000,000)
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
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
Minimum | Restricted Stock Units (RSUs), Service-based
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award requisite service period	3 years