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Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | $ 12,913 | $ 12,913 | $ 12,719 | $ 12,652 | $ 13,972 | $ 13,889 | $ 13,866 | $ 12,652 | $ 13,866 |  |
Net income |  | 502 | 422 | 308 | 544 | 298 | 245 |  |  |  |
Net income |  | 502 |  |  | 544 |  |  | 1,232 | 1,084 |  |
Other comprehensive income |  | 2 | 1 | 2 | 2 | 2 | 2 |  |  |  |
Common stock issued, net of issuance cost | 2,200 | 2,185 |  |  |  |  |  |  |  |  |
Contribution from tax equity investor |  |  |  |  |  | 24 |  |  |  |  |
Cumulative effect of accounting changes |  |  |  |  |  |  |  |  |  | $ 0 | $ 5
Common stock dividends declared |  | (219) | (200) | (200) | (197) | (197) | (197) |  |  |  |
Dividends to noncontrolling interests |  | (31) | (30) | (30) | (31) | (30) | (30) |  |  |  |
Stock-based compensation |  | (5) | (4) | (18) | (5) | (4) | (8) |  |  |  |
Noncash stock-based compensation |  | 6 | 5 | 5 | 4 | 6 | 5 |  |  |  |
Deconsolidation of SoCore Energy |  |  |  |  |  | (15) |  |  |  |  |
Other |  |  |  |  |  | (1) | 1 |  |  |  |
Balance, at the end of the period |  | $ 15,353 | $ 12,913 | $ 12,719 | $ 14,289 | $ 13,972 | $ 13,889 | 15,353 | 14,289 |  |
Dividends declared per common share (in dollars per share) |  | $ 0.6125 | $ 0.6125 | $ 0.6125 | $ 0.6050 | $ 0.6050 | $ 0.6050 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  | 0.255 | 0.255 | 0.255 | 0.255 | 0.255 | 0.255 |  |  |  |
Preference stock dividends (in dollars per share) |  | 15.625 | 15.625 | 15.625 | 15.625 | 15.625 | 15.625 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  | 0.299 | 0.299 | 0.299 | 0.299 | 0.299 | 0.299 |  |  |  |
Preference stock dividends (in dollars per share) |  | $ 35.936 | $ 35.936 | $ 35.936 | $ 35.936 | $ 35.936 | $ 35.936 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 2,555 | $ 2,555 | $ 2,550 | $ 2,545 | $ 2,537 | $ 2,531 | $ 2,526 | 2,545 | 2,526 |  |
Common stock issued, net of issuance cost |  | 2,185 |  |  |  |  |  |  |  |  |
Noncash stock-based compensation |  | 6 | 5 | 5 | 4 | 6 | 5 |  |  |  |
Balance, at the end of the period |  | 4,746 | 2,555 | 2,550 | 2,541 | 2,537 | 2,531 | 4,746 | 2,541 |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | (57) | (57) | (58) | (50) | (44) | (46) | (43) | (50) | (43) |  |
Other comprehensive income |  | 2 | 1 | 2 | 2 | 2 | 2 |  |  |  |
Cumulative effect of accounting changes |  |  |  |  |  |  |  |  |  | (10) | (5)
Balance, at the end of the period |  | (55) | (57) | (58) | (42) | (44) | (46) | (55) | (42) |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 8,222 | 8,222 | 8,034 | 7,964 | 9,286 | 9,211 | 9,188 | 7,964 | 9,188 |  |
Net income |  | 471 | 392 | 278 | 513 | 276 | 218 |  |  |  |
Cumulative effect of accounting changes |  |  |  |  |  |  |  |  |  | 10 | 10
Common stock dividends declared |  | (219) | (200) | (200) | (197) | (197) | (197) |  |  |  |
Stock-based compensation |  | (5) | (4) | (18) | (5) | (4) | (8) |  |  |  |
Balance, at the end of the period |  | 8,469 | 8,222 | 8,034 | 9,597 | 9,286 | 9,211 | 8,469 | 9,597 |  |
Subtotal |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 10,720 | 10,720 | 10,526 | 10,459 | 11,779 | 11,696 | 11,671 | 10,459 | 11,671 |  |
Net income |  | 471 | 392 | 278 | 513 | 276 | 218 |  |  |  |
Other comprehensive income |  | 2 | 1 | 2 | 2 | 2 | 2 |  |  |  |
Common stock issued, net of issuance cost |  | 2,185 |  |  |  |  |  |  |  |  |
Cumulative effect of accounting changes |  |  |  |  |  |  |  |  |  |  | 5
Common stock dividends declared |  | (219) | (200) | (200) | (197) | (197) | (197) |  |  |  |
Stock-based compensation |  | (5) | (4) | (18) | (5) | (4) | (8) |  |  |  |
Noncash stock-based compensation |  | 6 | 5 | 5 | 4 | 6 | 5 |  |  |  |
Balance, at the end of the period |  | 13,160 | 10,720 | 10,526 | 12,096 | 11,779 | 11,696 | 13,160 | 12,096 |  |
Noncontrolling Interests, Other |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period |  |  |  |  | 0 | 0 | 2 |  | 2 |  |
Net income |  |  |  |  |  | (8) | (3) |  |  |  |
Contribution from tax equity investor |  |  |  |  |  | 24 |  |  |  |  |
Deconsolidation of SoCore Energy |  |  |  |  |  | (15) |  |  |  |  |
Other |  |  |  |  |  | (1) | 1 |  |  |  |
Balance, at the end of the period |  |  |  |  | 0 | 0 | 0 |  | 0 |  |
Noncontrolling Interests, Preferred and Preference Stock |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 |  |
Net income |  | 31 | 30 | 30 | 31 | 30 | 30 |  |  |  |
Dividends to noncontrolling interests |  | (31) | (30) | (30) | (31) | (30) | (30) |  |  |  |
Balance, at the end of the period |  | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 |  |
Southern California Edison |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 15,492 | 15,492 | 13,870 | 13,785 | 14,946 | 14,748 | 14,672 | 13,785 | 14,672 |  |
Net income |  | 534 | 449 | 323 | 567 | 327 | 316 | 1,306 | 1,210 |  |
Other comprehensive income |  | 1 | 1 | 1 | 1 | 1 | 2 |  |  |  |
Capital contribution from Edison International Parent |  | 1,850 | 1,200 |  |  |  |  |  |  |  |
Cumulative effect of accounting changes |  |  |  |  |  |  |  |  |  | 0 | 0
Common stock dividends declared |  | (200) |  | (200) | (264) | (100) | (212) |  |  |  |
Dividends declared on preferred and preference stock |  | (31) | (30) | (30) | (31) | (30) | (30) |  |  |  |
Stock-based compensation |  | (4) | (1) | (12) | (4) | (3) | (2) |  |  |  |
Noncash stock-based compensation |  | 3 | 3 | 3 | 2 | 3 | 2 |  |  |  |
Balance, at the end of the period |  | $ 17,645 | $ 15,492 | $ 13,870 | $ 15,217 | $ 14,946 | $ 14,748 | 17,645 | 15,217 |  |
Dividends declared per common share (in dollars per share) |  | $ 0.6050 | $ 0.6050 | $ 0.4599 | $ 0.6071 | $ 0.2299 | $ 0.4875 |  |  |  |
Southern California Edison | Minimum |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  | 0.255 | 0.255 | 0.255 | 0.255 | 0.255 | 0.255 |  |  |  |
Preference stock dividends (in dollars per share) |  | 15.625 | 15.625 | 15.625 | 15.625 | 15.625 | 15.625 |  |  |  |
Southern California Edison | Maximum |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  | 0.299 | 0.299 | 0.299 | 0.299 | 0.299 | 0.299 |  |  |  |
Preference stock dividends (in dollars per share) |  | $ 35.936 | $ 35.936 | $ 35.936 | $ 35.936 | $ 35.936 | $ 35.936 |  |  |  |
Southern California Edison | Preferred and Preference Stock |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 2,245 | $ 2,245 | $ 2,245 | $ 2,245 | $ 2,245 | $ 2,245 | $ 2,245 | 2,245 | 2,245 |  |
Balance, at the end of the period |  | 2,245 | 2,245 | 2,245 | 2,245 | 2,245 | 2,245 | 2,245 | 2,245 |  |
Southern California Edison | Common Stock |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 2,168 | 2,168 | 2,168 | 2,168 | 2,168 | 2,168 | 2,168 | 2,168 | 2,168 |  |
Balance, at the end of the period |  | 2,168 | 2,168 | 2,168 | 2,168 | 2,168 | 2,168 | 2,168 | 2,168 |  |
Southern California Edison | Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 1,886 | 1,886 | 683 | 680 | 676 | 673 | 671 | 680 | 671 |  |
Capital contribution from Edison International Parent |  | 1,850 | 1,200 |  |  |  |  |  |  |  |
Stock-based compensation |  | (2) |  |  |  |  |  |  |  |  |
Noncash stock-based compensation |  | 3 | 3 | 3 | 2 | 3 | 2 |  |  |  |
Balance, at the end of the period |  | 3,737 | 1,886 | 683 | 678 | 676 | 673 | 3,737 | 678 |  |
Southern California Edison | Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | (26) | (26) | (27) | (23) | (21) | (22) | (19) | (23) | (19) |  |
Other comprehensive income |  | 1 | 1 | 1 | 1 | 1 | 2 |  |  |  |
Cumulative effect of accounting changes |  |  |  |  |  |  |  |  |  | (5) | (5)
Balance, at the end of the period |  | (25) | (26) | (27) | (20) | (21) | (22) | (25) | (20) |  |
Southern California Edison | Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | $ 9,219 | 9,219 | 8,801 | 8,715 | 9,878 | 9,684 | 9,607 | 8,715 | 9,607 |  |
Net income |  | 534 | 449 | 323 | 567 | 327 | 316 |  |  |  |
Cumulative effect of accounting changes |  |  |  |  |  |  |  |  |  | $ 5 | $ 5
Common stock dividends declared |  | (200) |  | (200) | (264) | (100) | (212) |  |  |  |
Dividends declared on preferred and preference stock |  | (31) | (30) | (30) | (31) | (30) | (30) |  |  |  |
Stock-based compensation |  | (2) | (1) | (12) | (4) | (3) | (2) |  |  |  |
Balance, at the end of the period |  | $ 9,520 | $ 9,219 | $ 8,801 | $ 10,146 | $ 9,878 | $ 9,684 | $ 9,520 | $ 10,146 |  |

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