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Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Jan. 01, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period | $ 15,496 | $ 12,652 | $ 12,652 |
Net income | 213 | 308 |  |
Other comprehensive income | 2 | 2 |  |
Common stock issued, net of issuance cost | 88 |  |  |
Cumulative effect of accounting changes |  |  |  | $ 0
Common stock dividends declared | (232) | (200) |  |
Dividends to noncontrolling interests | (30) | (30) |  |
Stock-based compensation |  | (18) |  |
Noncash stock-based compensation | 7 | 5 |  |
Balance, at the end of the period | $ 15,544 | $ 12,719 | 15,496 |
Dividends declared per common share (in dollars per share) | $ 0.6375 | $ 0.6125 |  |
Minimum |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Preferred stock dividends (in dollars per share) | 0.255 | 0.255 |  |
Preference stock dividends (in dollars per share) | 15.625 | 15.625 |  |
Maximum |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Preferred stock dividends (in dollars per share) | 0.299 | 0.299 |  |
Preference stock dividends (in dollars per share) | $ 35.936 | $ 35.936 |  |
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period | $ 4,990 | $ 2,545 | 2,545 |
Common stock issued, net of issuance cost | 88 |  |  |
Noncash stock-based compensation | 7 | 5 |  |
Balance, at the end of the period | 5,085 | 2,550 | 4,990 |
Accumulated Other Comprehensive Loss |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period | (69) | (50) | (50) |
Other comprehensive income | 2 | 2 |  |
Cumulative effect of accounting changes |  |  |  | (10)
Balance, at the end of the period | (67) | (58) | (69) |
Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period | 8,382 | 7,964 | 7,964 |
Net income | 183 | 278 |  |
Cumulative effect of accounting changes |  |  |  | 10
Common stock dividends declared | (232) | (200) |  |
Stock-based compensation |  | (18) |  |
Balance, at the end of the period | 8,333 | 8,034 | 8,382 |
Subtotal |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period | 13,303 | 10,459 | 10,459 |
Net income | 183 | 278 |  |
Other comprehensive income | 2 | 2 |  |
Common stock issued, net of issuance cost | 88 |  |  |
Cumulative effect of accounting changes |  |  |  | 0
Common stock dividends declared | (232) | (200) |  |
Stock-based compensation |  | (18) |  |
Noncash stock-based compensation | 7 | 5 |  |
Balance, at the end of the period | 13,351 | 10,526 | 13,303 |
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 |
Net income | 30 | 30 |  |
Dividends to noncontrolling interests | (30) | (30) |  |
Balance, at the end of the period | 2,193 | 2,193 | 2,193 |
Southern California Edison |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period | 17,827 | 13,785 | 13,785 |
Net income | 249 | 323 |  |
Other comprehensive income | 2 | 1 |  |
Cumulative effect of accounting change |  |  | 269 |
Cumulative effect of accounting changes |  |  |  | 0
Common stock dividends declared | (269) | (200) |  |
Dividends declared on preferred and preference stock | (30) | (30) |  |
Stock-based compensation | (5) | (12) |  |
Noncash stock-based compensation | 3 | 3 |  |
Balance, at the end of the period | $ 18,046 | $ 13,870 | 17,827 |
Dividends declared per common share (in dollars per share) | $ 0.6125 | $ 0.6125 |  |
Southern California Edison | Minimum |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Preferred stock dividends (in dollars per share) | 0.255 | 0.255 |  |
Preference stock dividends (in dollars per share) | 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 |  |
Preference stock dividends (in dollars per share) | $ 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 |
Balance, at the end of the period | 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 |
Balance, at the end of the period | 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 | 3,939 | 680 | 680 |
Cumulative effect of accounting change |  |  | 269 |
Stock-based compensation | (5) |  |  |
Noncash stock-based compensation | 4 | 3 |  |
Balance, at the end of the period | 4,207 | 683 | 3,939 |
Southern California Edison | Accumulated Other Comprehensive Loss |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period | (39) | (23) | (23) |
Other comprehensive income | 2 | 1 |  |
Cumulative effect of accounting changes |  |  |  | (5)
Balance, at the end of the period | (37) | (27) | (39) |
Southern California Edison | Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period | 9,514 | 8,715 | 8,715 |
Net income | 249 | 323 |  |
Cumulative effect of accounting changes |  |  |  | $ 5
Common stock dividends declared | (269) | (200) |  |
Dividends declared on preferred and preference stock | (30) | (30) |  |
Stock-based compensation |  | (12) |  |
Noncash stock-based compensation | (1) |  |  |
Balance, at the end of the period | $ 9,463 | $ 8,801 | $ 9,514 |

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