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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | $ 13,866 | $ 14,187 | $ 14,187
Net income |  |  | 1,087 | 1,204 |
Net income | $ 544 | $ 501 | 1,084 | 1,202 |
Other comprehensive income |  |  | 6 |  |
Other comprehensive income | 2 | 0 | 1 | 5 |
Cumulative effect of accounting changes |  |  | 5 |  |
Contributions from tax equity investor |  |  | 24 |  |
Dividends declared on common stock |  |  | (591) | (530) |
Dividends to noncontrolling interests |  |  | (91) | (94) |
Stock-based compensation |  |  | (17) | (165) |
Noncash stock-based compensation |  |  | 15 | 15 |
Deconsolidation of SoCore Energy |  |  | (15) |  |
Issuance of preference stock |  |  |  | 463 |
Redemption of preference stock |  |  |  | (475) |
Balance, at the end of the period | $ 14,289 | $ 14,610 | $ 14,289 | $ 14,610 | 13,866
Dividends declared per common share (in dollars per share) | $ 0.6050 | $ 0.5425 | $ 1.815 | $ 1.6275 |
Common Stock Including Additional Paid in Capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | $ 2,526 | $ 2,505 | 2,505
Net income |  |  | 0 | 0 |
Other comprehensive income |  |  | 0 |  |
Other comprehensive income |  |  |  | 0 |
Cumulative effect of accounting changes |  |  | 0 |  |
Dividends declared on common stock |  |  | 0 | 0 |
Dividends to noncontrolling interests |  |  | 0 | 0 |
Stock-based compensation |  |  | 0 | 0 |
Noncash stock-based compensation |  |  | 15 | 15 |
Deconsolidation of SoCore Energy |  |  | 0 |  |
Issuance of preference stock |  |  |  | 0 |
Redemption of preference stock |  |  |  | 0 |
Balance, at the end of the period | $ 2,541 | $ 2,520 | 2,541 | 2,520 | 2,526
Accumulated Other Comprehensive Loss |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | (43) | (53) | (53)
Net income |  |  | 0 | 0 |
Other comprehensive income |  |  | 6 |  |
Other comprehensive income |  |  |  | 5 |
Cumulative effect of accounting changes |  |  | (5) |  |
Dividends declared on common stock |  |  | 0 | 0 |
Dividends to noncontrolling interests |  |  | 0 | 0 |
Stock-based compensation |  |  | 0 | 0 |
Noncash stock-based compensation |  |  | 0 | 0 |
Deconsolidation of SoCore Energy |  |  | 0 |  |
Issuance of preference stock |  |  |  | 0 |
Redemption of preference stock |  |  |  | 0 |
Balance, at the end of the period | (42) | (48) | (42) | (48) | (43)
Retained Earnings |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | 9,188 | 9,544 | 9,544
Net income |  |  | 1,007 | 1,110 |
Other comprehensive income |  |  | 0 |  |
Other comprehensive income |  |  |  | 0 |
Cumulative effect of accounting changes |  |  | 10 |  |
Dividends declared on common stock |  |  | (591) | (530) |
Dividends to noncontrolling interests |  |  | 0 | 0 |
Stock-based compensation |  |  | (17) | (165) |
Noncash stock-based compensation |  |  | 0 | 0 |
Deconsolidation of SoCore Energy |  |  | 0 |  |
Issuance of preference stock |  |  |  | 0 |
Redemption of preference stock |  |  |  | (15) |
Balance, at the end of the period | 9,597 | 9,944 | 9,597 | 9,944 | 9,188
Subtotal |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | 11,671 | 11,996 | 11,996
Net income |  |  | 1,007 | 1,110 |
Other comprehensive income |  |  | 6 |  |
Other comprehensive income |  |  |  | 5 |
Cumulative effect of accounting changes |  |  | 5 |  |
Dividends declared on common stock |  |  | (591) | (530) |
Dividends to noncontrolling interests |  |  | 0 | 0 |
Stock-based compensation |  |  | (17) | (165) |
Noncash stock-based compensation |  |  | 15 | 15 |
Deconsolidation of SoCore Energy |  |  | 0 |  |
Issuance of preference stock |  |  |  | 0 |
Redemption of preference stock |  |  |  | (15) |
Balance, at the end of the period | 12,096 | 12,416 | 12,096 | 12,416 | 11,671
Noncontrolling Interests, Other |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | 2 |  |
Net income |  |  | (11) |  |
Other comprehensive income |  |  | 0 |  |
Cumulative effect of accounting changes |  |  | 0 |  |
Contributions from tax equity investor |  |  | 24 |  |
Dividends declared on common stock |  |  | 0 |  |
Dividends to noncontrolling interests |  |  | 0 |  |
Stock-based compensation |  |  | 0 |  |
Noncash stock-based compensation |  |  | 0 |  |
Deconsolidation of SoCore Energy |  |  | (15) |  |
Balance, at the end of the period | 0 |  | 0 |  | 2
Noncontrolling Interests, Preferred and Preference Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | 2,193 | 2,191 | 2,191
Net income |  |  | 91 | 94 |
Other comprehensive income |  |  | 0 |  |
Other comprehensive income |  |  |  | 0 |
Cumulative effect of accounting changes |  |  | 0 |  |
Dividends declared on common stock |  |  | 0 | 0 |
Dividends to noncontrolling interests |  |  | (91) | (94) |
Stock-based compensation |  |  | 0 | 0 |
Noncash stock-based compensation |  |  | 0 | 0 |
Deconsolidation of SoCore Energy |  |  | 0 |  |
Issuance of preference stock |  |  |  | 463 |
Redemption of preference stock |  |  |  | (460) |
Balance, at the end of the period | 2,193 | 2,194 | 2,193 | 2,194 | 2,193
Southern California Edison |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | 14,672 | 14,483 | 14,483
Net income | 567 | 497 | 1,210 | 1,215 |
Other comprehensive income |  |  | 4 |  |
Other comprehensive income | 1 | 0 | (1) | 2 |
Cumulative effect of accounting changes |  |  | 0 |  |
Dividends declared on common stock |  |  | (576) | (573) |
Dividends declared on preferred and preference stock |  |  | (91) | (94) |
Stock-based compensation |  |  | (9) | (36) |
Noncash stock-based compensation |  |  | 7 | 8 |
Issuance of preference stock |  |  |  | 463 |
Redemption of preference stock |  |  |  | (475) |
Balance, at the end of the period | 15,217 | 14,993 | 15,217 | 14,993 | 14,672
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
Net income |  |  | 0 | 0 |
Other comprehensive income |  |  | 0 |  |
Other comprehensive income |  |  |  | 0 |
Cumulative effect of accounting changes |  |  | 0 |  |
Dividends declared on common stock |  |  | 0 | 0 |
Dividends declared on preferred and preference stock |  |  | 0 | 0 |
Stock-based compensation |  |  | 0 | 0 |
Noncash stock-based compensation |  |  | 0 | 0 |
Issuance of preference stock |  |  |  | 0 |
Redemption of preference stock |  |  |  | 0 |
Balance, at the end of the period | 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 |  |  | 671 | 657 | 657
Net income |  |  | 0 | 0 |
Other comprehensive income |  |  | 0 |  |
Other comprehensive income |  |  |  | 0 |
Cumulative effect of accounting changes |  |  | 0 |  |
Dividends declared on common stock |  |  | 0 | 0 |
Dividends declared on preferred and preference stock |  |  | 0 | 0 |
Stock-based compensation |  |  | 0 | 0 |
Noncash stock-based compensation |  |  | 7 | 8 |
Issuance of preference stock |  |  |  | (12) |
Redemption of preference stock |  |  |  | 15 |
Balance, at the end of the period | 678 | 668 | 678 | 668 | 671
Southern California Edison | Accumulated Other Comprehensive Loss |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | (19) | (20) | (20)
Net income |  |  | 0 | 0 |
Other comprehensive income |  |  | 4 |  |
Other comprehensive income |  |  |  | 2 |
Cumulative effect of accounting changes |  |  | (5) |  |
Dividends declared on common stock |  |  | 0 | 0 |
Dividends declared on preferred and preference stock |  |  | 0 | 0 |
Stock-based compensation |  |  | 0 | 0 |
Noncash stock-based compensation |  |  | 0 | 0 |
Issuance of preference stock |  |  |  | 0 |
Redemption of preference stock |  |  |  | 0 |
Balance, at the end of the period | (20) | (18) | (20) | (18) | (19)
Southern California Edison | Retained Earnings |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, at the beginning of the period |  |  | 9,607 | 9,433 | 9,433
Net income |  |  | 1,210 | 1,215 |
Other comprehensive income |  |  | 0 |  |
Other comprehensive income |  |  |  | 0 |
Cumulative effect of accounting changes |  |  | 5 |  |
Dividends declared on common stock |  |  | (576) | (573) |
Dividends declared on preferred and preference stock |  |  | (91) | (94) |
Stock-based compensation |  |  | (9) | (36) |
Noncash stock-based compensation |  |  | 0 | 0 |
Issuance of preference stock |  |  |  | 0 |
Redemption of preference stock |  |  |  | (15) |
Balance, at the end of the period | 10,146 | 9,930 | 10,146 | 9,930 | 9,607
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
Net income |  |  | 0 | 0 |
Other comprehensive income |  |  | 0 |  |
Other comprehensive income |  |  |  | 0 |
Cumulative effect of accounting changes |  |  | 0 |  |
Dividends declared on common stock |  |  | 0 | 0 |
Dividends declared on preferred and preference stock |  |  | 0 | 0 |
Stock-based compensation |  |  | 0 | 0 |
Noncash stock-based compensation |  |  | 0 | 0 |
Issuance of preference stock |  |  |  | 475 |
Redemption of preference stock |  |  |  | (475) |
Balance, at the end of the period | $ 2,245 | $ 2,245 | $ 2,245 | $ 2,245 | $ 2,245

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