CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common stock dividends declared (USD per share)	$ 4.18	$ 3.87	$ 3.58
Sales, net of offering costs	$ 28	$ 5	$ 90
Shareholders' equity [Member]
Sales, net of offering costs	1	4	4
Non-controlling interests [Member]
Sales, net of offering costs	$ 27	$ 1	$ 86
Preferred Class A [Member]
Preferred stock, dividends declared per share (USD per share)	$ 6.00	$ 6.00	$ 6.10
Preferred Class B [Member]
Preferred stock, dividends declared per share (USD per share)	6.75	6.75	3.41
Series C Preferred Stock [Member]
Preferred stock, dividends declared per share (USD per share)	27.90
Southern California Gas Company [Member]
Preferred stock, dividends declared per share (USD per share)	1.50	1.50	1.50
Common stock dividends declared (USD per share)	1.10	$ 1.64	0.55
San Diego Gas and Electric Company [Member]
Common stock dividends declared (USD per share)	$ 1.72		$ 2.14