QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Selected Quarterly Financial Information [Line Items] | |||||||||||
| Quarterly Financial Data, Revenues | $ 2,870,000,000 | $ 2,535,000,000 | $ 2,156,000,000 | $ 2,622,000,000 | $ 2,701,000,000 | $ 2,481,000,000 | $ 2,367,000,000 | $ 2,682,000,000 | |||
| Quarterly Financial Data, Expenses And Other Income | 2,365,000,000 | 1,553,000,000 | 2,268,000,000 | 2,167,000,000 | 2,269,000,000 | 2,211,000,000 | 1,971,000,000 | 2,076,000,000 | |||
| Quarterly Financial Data, Net Income (Loss) | 409,000,000 | 719,000,000 | 27,000,000 | 364,000,000 | 388,000,000 | 282,000,000 | 320,000,000 | 458,000,000 | |||
| Earnings | $ 379,000,000 | $ 622,000,000 | $ 16,000,000 | $ 353,000,000 | $ 369,000,000 | $ 248,000,000 | $ 295,000,000 | $ 437,000,000 | $ 1,370,000,000 | $ 1,349,000,000 | $ 1,161,000,000 |
| Quarterly Financial Data, Net Income Per Share, Basic (in dollars per share) | $ 1.63 | $ 2.87 | $ 0.11 | $ 1.46 | $ 1.56 | $ 1.14 | $ 1.29 | $ 1.85 | |||
| Basic earnings per common share (in dollars per share) | $ 1.51 | $ 2.48 | $ 0.06 | $ 1.41 | $ 1.48 | $ 1.00 | $ 1.19 | $ 1.76 | $ 5.48 | $ 5.43 | $ 4.72 |
| Weighted-average number of shares outstanding, basic | 250,600 | 250,400 | 250,100 | 249,700 | 248,700 | 248,400 | 248,100 | 247,700 | 250,217 | 248,249 | 245,891 |
| Quarterly Financial Data, Net Income Per Share, Diluted (in dollars per share) | $ 1.62 | $ 2.85 | $ 0.11 | $ 1.45 | $ 1.54 | $ 1.12 | $ 1.27 | $ 1.83 | |||
| Diluted earnings per common share (in dollars per share) | $ 1.51 | $ 2.46 | $ 0.06 | $ 1.40 | $ 1.47 | $ 0.99 | $ 1.17 | $ 1.74 | $ 5.46 | $ 5.37 | $ 4.63 |
| Weighted-average number of shares outstanding, diluted | 251,600 | 252,400 | 252,000 | 251,500 | 251,500 | 251,000 | 251,500 | 251,200 | 251,155 | 250,923 | 250,655 |
| Parent Company [Member] | |||||||||||
| Selected Quarterly Financial Information [Line Items] | |||||||||||
| Earnings | $ 1,370,000,000 | $ 1,349,000,000 | $ 1,161,000,000 | ||||||||
| Basic earnings per common share (in dollars per share) | $ 5.48 | $ 5.43 | $ 4.72 | ||||||||
| Weighted-average number of shares outstanding, basic | 250,217 | 248,249 | 245,891 | ||||||||
| Diluted earnings per common share (in dollars per share) | $ 5.46 | $ 5.37 | $ 4.63 | ||||||||
| Weighted-average number of shares outstanding, diluted | 251,155 | 250,923 | 250,655 | ||||||||
| San Diego Gas and Electric Company [Member] | |||||||||||
| Selected Quarterly Financial Information [Line Items] | |||||||||||
| Quarterly Financial Data, Revenues | $ 1,061,000,000 | $ 1,209,000,000 | $ 992,000,000 | $ 991,000,000 | $ 1,051,000,000 | $ 1,230,000,000 | $ 972,000,000 | $ 966,000,000 | |||
| Quarterly Financial Data, Operating Expenses | 800,000,000 | 886,000,000 | 822,000,000 | 755,000,000 | 802,000,000 | 930,000,000 | 745,000,000 | 684,000,000 | |||
| Quarterly Financial Data, Operating Income | 261,000,000 | 323,000,000 | 170,000,000 | 236,000,000 | 249,000,000 | 300,000,000 | 227,000,000 | 282,000,000 | |||
| Quarterly Financial Data, Net Income (Loss) | 147,000,000 | 194,000,000 | 87,000,000 | 137,000,000 | 143,000,000 | 182,000,000 | 130,000,000 | 151,000,000 | |||
| Quarterly Financial Data, (Earnings) Losses Attributable To Noncontrolling Interests | (4,000,000) | 11,000,000 | (13,000,000) | 1,000,000 | (1,000,000) | 12,000,000 | 4,000,000 | 4,000,000 | |||
| Earnings | $ 570,000,000 | $ 587,000,000 | $ 507,000,000 | ||||||||
| Quarterly Financial Data, Earnings Attributable To Common Shares | 151,000,000 | 183,000,000 | 100,000,000 | 136,000,000 | 144,000,000 | 170,000,000 | 126,000,000 | 147,000,000 | |||
| Southern California Gas Company [Member] | |||||||||||
| Selected Quarterly Financial Information [Line Items] | |||||||||||
| Quarterly Financial Data, Revenues | 1,135,000,000 | 686,000,000 | 617,000,000 | 1,033,000,000 | 1,041,000,000 | 620,000,000 | 780,000,000 | 1,048,000,000 | |||
| Quarterly Financial Data, Operating Expenses | 899,000,000 | 648,000,000 | 628,000,000 | 739,000,000 | 834,000,000 | 633,000,000 | 686,000,000 | 728,000,000 | |||
| Quarterly Financial Data, Operating Income | 236,000,000 | 38,000,000 | (11,000,000) | 294,000,000 | 207,000,000 | (13,000,000) | 94,000,000 | 320,000,000 | |||
| Quarterly Financial Data, Net Income (Loss) | 151,000,000 | 0 | 0 | 199,000,000 | 143,000,000 | (8,000,000) | 71,000,000 | 214,000,000 | |||
| Earnings | $ 350,000,000 | $ 420,000,000 | $ 333,000,000 | ||||||||
| Quarterly Financial Data, Dividends On Preferred Stock | 0 | 0 | 1,000,000 | 0 | 0 | 0 | 1,000,000 | 0 | |||
| Quarterly Financial Data, Earnings Attributable To Common Shares | $ 151,000,000 | $ 0 | $ (1,000,000) | $ 199,000,000 | $ 143,000,000 | $ (8,000,000) | $ 70,000,000 | $ 214,000,000 | |||