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Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | $ 16,446 | $ 15,544 | $ 15,496 | $ 12,913 | $ 12,719 | $ 12,652 | $ 15,496 | $ 12,652 |
Net income (loss) | (242) | 348 | 213 | 502 | 422 | 308 |  |  |
Other comprehensive income | 2 | 2 | 2 | 2 | 1 | 2 |  |  |
Common stock issued, net of issuance cost | 15 | 815 | 88 | 2,185 |  |  |  |  |
Common stock dividends declared | (241) | (241) | (232) | (219) | (200) | (200) |  |  |
Dividends to noncontrolling interests | (31) | (30) | (30) | (31) | (30) | (30) |  |  |
Stock-based compensation |  |  |  | (5) | (4) | (18) |  |  |
Noncash stock-based compensation | 8 | 8 | 7 | 6 | 5 | 5 |  |  |
Redemption of preferred and preference stock | 308 |  |  |  |  |  |  |  |
Balance, at the end of the period | $ 15,649 | $ 16,446 | $ 15,544 | $ 15,353 | $ 12,913 | $ 12,719 | 15,649 | 15,353 | $ 12,652
Dividends declared per common share (in dollars per share) | $ 0.6375 | $ 0.6375 | $ 0.6375 | $ 0.6125 | $ 0.6125 | $ 0.6125 |  |  |
Accounting Standards Update [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201802Member
Cumulative effect adjustment |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period |  |  |  |  |  | $ 0 |  | 0 |
Balance, at the end of the period |  |  |  |  |  |  |  |  | $ 0
Minimum |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Preferred stock, dividends per share, declared (in dollars per share) | 0.247 | 0.255 | 0.255 | 0.255 | 0.255 | $ 0.255 |  |  |
Preference stock, dividends per share, declared (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 per share, declared (in dollars per share) | 0.289 | 0.299 | 0.299 | 0.299 | 0.299 | 0.299 |  |  |
Preference stock, dividends per share, declared (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 | $ 5,908 | $ 5,085 | $ 4,990 | $ 2,555 | $ 2,550 | $ 2,545 | 4,990 | 2,545 |
Common stock issued, net of issuance cost | 15 | 815 | 88 | 2,185 |  |  |  |  |
Noncash stock-based compensation | 7 | 8 | 7 | 6 | 5 | 5 |  |  |
Balance, at the end of the period | 5,930 | 5,908 | 5,085 | 4,746 | 2,555 | 2,550 | 5,930 | 4,746 | 2,545
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | (65) | (67) | (69) | (57) | (58) | (50) | (69) | (50) |
Other comprehensive income | 2 | 2 | 2 | 2 | 1 | 2 |  |  |
Balance, at the end of the period | (63) | (65) | (67) | (55) | (57) | (58) | (63) | (55) | (50)
Accumulated Other Comprehensive Loss | Cumulative effect adjustment |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period |  |  |  |  |  | (10) |  | (10) |
Balance, at the end of the period |  |  |  |  |  |  |  |  | (10)
Retained Earnings |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 8,410 | 8,333 | 8,382 | 8,222 | 8,034 | 7,964 | 8,382 | 7,964 |
Net income (loss) | (288) | 318 | 183 | 471 | 392 | 278 |  |  |
Common stock dividends declared | (241) | (241) | (232) | (219) | (200) | (200) |  |  |
Stock-based compensation |  |  |  | (5) | (4) | (18) |  |  |
Balance, at the end of the period | 7,881 | 8,410 | 8,333 | 8,469 | 8,222 | 8,034 | 7,881 | 8,469 | 7,964
Retained Earnings | Cumulative effect adjustment |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period |  |  |  |  |  | 10 |  | 10 |
Balance, at the end of the period |  |  |  |  |  |  |  |  | 10
Subtotal |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 14,253 | 13,351 | 13,303 | 10,720 | 10,526 | 10,459 | 13,303 | 10,459 |
Net income (loss) | (288) | 318 | 183 | 471 | 392 | 278 |  |  |
Other comprehensive income | 2 | 2 | 2 | 2 | 1 | 2 |  |  |
Common stock issued, net of issuance cost | 15 | 815 | 88 | 2,185 |  |  |  |  |
Common stock dividends declared | (241) | (241) | (232) | (219) | (200) | (200) |  |  |
Stock-based compensation |  |  |  | (5) | (4) | (18) |  |  |
Noncash stock-based compensation | 7 | 8 | 7 | 6 | 5 | 5 |  |  |
Balance, at the end of the period | 13,748 | 14,253 | 13,351 | 13,160 | 10,720 | 10,526 | 13,748 | 13,160 | 10,459
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 |
Net income (loss) | 46 | 30 | 30 | 31 | 30 | 30 |  |  |
Dividends to noncontrolling interests | (31) | (30) | (30) | (31) | (30) | (30) |  |  |
Noncash stock-based compensation | 1 |  |  |  |  |  |  |  |
Redemption of preferred and preference stock | (308) |  |  |  |  |  |  |  |
Balance, at the end of the period | 1,901 | 2,193 | 2,193 | 2,193 | 2,193 | 2,193 | 1,901 | 2,193 | 2,193
Southern California Edison |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 18,781 | 18,046 | 17,827 | 15,492 | 13,870 | 13,785 | 17,827 | 13,785 |
Net income (loss) | (218) | 411 | 249 | 534 | 449 | 323 |  |  |
Other comprehensive income | 1 | 1 | 2 | 1 | 1 | 1 |  |  |
Capital contribution from Edison International Parent | 219 | 619 | 269 | 1,850 | 1,200 |  |  |  |
Common stock dividends declared | (269) | (269) | (269) | (200) |  | (200) |  |  |
Dividends declared on preferred and preference stock | (31) | (30) | (30) | (31) | (30) | (30) |  |  |
Stock-based compensation |  |  | (5) | (4) | (1) | (12) |  |  |
Noncash stock-based compensation | 4 | 3 | 3 | 3 | 3 | 3 |  |  |
Redemption of preferred and preference stock | (120) |  |  |  |  |  | (308) |  |
Balance, at the end of the period | $ 18,179 | $ 18,781 | $ 18,046 | $ 17,645 | $ 15,492 | $ 13,870 | 18,179 | 17,645 | $ 13,785
Dividends declared per common share (in dollars per share) | $ 0.6185 | $ 0.6185 | $ 0.6185 | $ 0.4599 |  | $ 0.4599 |  |  |
Accounting Standards Update [Extensible List] |  |  |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201802Member
Southern California Edison | Cumulative effect adjustment |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period |  |  |  |  |  | $ 0 |  | 0 |
Balance, at the end of the period |  |  |  |  |  |  |  |  | $ 0
Southern California Edison | Minimum |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Preferred stock, dividends per share, declared (in dollars per share) | 0.247 | 0.255 | 0.255 | $ 0.255 | $ 0.255 | $ 0.255 |  |  |
Preference stock, dividends per share, declared (in dollars per share) | 15.625 | 15.625 | 15.625 |  | 15.625 | 15.625 |  |  |
Southern California Edison | Maximum |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Preferred stock, dividends per share, declared (in dollars per share) | 0.289 | 0.299 | 0.299 |  | 0.299 | 0.299 |  |  |
Preference stock, dividends per share, declared (in dollars per share) | $ 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 |
Redemption of preferred and preference stock | (300) |  |  |  |  |  |  |  |
Balance, at the end of the period | 1,945 | 2,245 | 2,245 | 2,245 | 2,245 | 2,245 | 1,945 | 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 |
Balance, at the end of the period | 2,168 | 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 | 4,829 | 4,207 | 3,939 | 1,886 | 683 | 680 | 3,939 | 680 |
Capital contribution from Edison International Parent | 219 | 619 | 269 | 1,850 | 1,200 |  |  |  |
Stock-based compensation |  |  | (5) | (2) |  |  |  |  |
Noncash stock-based compensation | 3 | 3 | 4 | 3 | 3 | 3 |  |  |
Redemption of preferred and preference stock | 7 |  |  |  |  |  |  |  |
Balance, at the end of the period | 5,058 | 4,829 | 4,207 | 3,737 | 1,886 | 683 | 5,058 | 3,737 | 680
Southern California Edison | Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | (36) | (37) | (39) | (26) | (27) | (23) | (39) | (23) |
Other comprehensive income | 1 | 1 | 2 | 1 | 1 | 1 |  |  |
Balance, at the end of the period | (35) | (36) | (37) | (25) | (26) | (27) | (35) | (25) | (23)
Southern California Edison | Accumulated Other Comprehensive Loss | Cumulative effect adjustment |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period |  |  |  |  |  | (5) |  | (5) |
Balance, at the end of the period |  |  |  |  |  |  |  |  | (5)
Southern California Edison | Retained Earnings |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period | 9,575 | 9,463 | 9,514 | 9,219 | 8,801 | 8,715 | 9,514 | 8,715 |
Net income (loss) | (218) | 411 | 249 | 534 | 449 | 323 |  |  |
Common stock dividends declared | (269) | (269) | (269) | (200) |  | (200) |  |  |
Dividends declared on preferred and preference stock | (31) | (30) | (30) | (31) | (30) | (30) |  |  |
Stock-based compensation |  |  |  | (2) | (1) | (12) |  |  |
Noncash stock-based compensation | 1 |  | (1) |  |  |  |  |  |
Redemption of preferred and preference stock | (15) |  |  |  |  |  |  |  |
Balance, at the end of the period | $ 9,043 | $ 9,575 | $ 9,463 | $ 9,520 | $ 9,219 | 8,801 | $ 9,043 | 9,520 | 8,715
Southern California Edison | Retained Earnings | Cumulative effect adjustment |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, at the beginning of the period |  |  |  |  |  | $ 5 |  | $ 5 |
Balance, at the end of the period |  |  |  |  |  |  |  |  | $ 5

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