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Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | $ 13,866 | $ 14,187
Net income | 245 | 393
Net income | 242 | 392
Other comprehensive income | 2 |
Other comprehensive income | (3) | 4
Cumulative effect of accounting changes | 5 |
Dividends declared on common stock | (197) | (177)
Dividends to noncontrolling interests | (30) | (31)
Stock-based compensation | (8) | (139)
Noncash stock-based compensation | 5 | 5
Other | 1 |
Balance, at the end of the period | $ 13,889 | $ 14,242
Dividends declared per common share (in dollars per share) | $ 0.6050 | $ 0.5425
Common Stock Including Additional Paid in Capital [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | $ 2,526 | $ 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 | 5 | 5
Other | 0 |
Balance, at the end of the period | 2,531 | 2,510
Accumulated Other Comprehensive Loss |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | (43) | (53)
Net income | 0 | 0
Other comprehensive income | 2 |
Other comprehensive income |  | 4
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
Other | 0 |
Balance, at the end of the period | (46) | (49)
Retained Earnings |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 9,188 | 9,544
Net income | 218 | 362
Other comprehensive income | 0 |
Other comprehensive income |  | 0
Cumulative effect of accounting changes | 10 |
Dividends declared on common stock | (197) | (177)
Dividends to noncontrolling interests | 0 | 0
Stock-based compensation | (8) | (139)
Noncash stock-based compensation | 0 | 0
Other | 0 |
Balance, at the end of the period | 9,211 | 9,590
Subtotal |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 11,671 | 11,996
Net income | 218 | 362
Other comprehensive income | 2 |
Other comprehensive income |  | 4
Cumulative effect of accounting changes | 5 |
Dividends declared on common stock | (197) | (177)
Dividends to noncontrolling interests | 0 | 0
Stock-based compensation | (8) | (139)
Noncash stock-based compensation | 5 | 5
Other | 0 |
Balance, at the end of the period | 11,696 | 12,051
Noncontrolling Interests, Other |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 2 |
Net income | (3) |
Other comprehensive income | 0 |
Cumulative effect of accounting changes | 0 |
Dividends declared on common stock | 0 |
Dividends to noncontrolling interests | 0 |
Stock-based compensation | 0 |
Noncash stock-based compensation | 0 |
Other | 1 |
Balance, at the end of the period | 0 |
Noncontrolling Interests, Preferred and Preference Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 2,193 | 2,191
Net income | 30 | 31
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 | (30) | (31)
Stock-based compensation | 0 | 0
Noncash stock-based compensation | 0 | 0
Other | 0 |
Balance, at the end of the period | 2,193 | 2,191
Southern California Edison |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 14,672 | 14,483
Net income | 316 | 380
Other comprehensive income | 2 |
Other comprehensive income | (3) | 2
Cumulative effect of accounting changes | 0 |
Dividends declared on common stock | (212) | (191)
Dividends declared on preferred and preference stock | (30) | (31)
Stock-based compensation | (2) | (23)
Noncash stock-based compensation | 2 |
Redemption of preference stock |  | (3)
Balance, at the end of the period | 14,748 | 14,623
Southern California Edison | Common stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 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 |
Redemption of preference stock |  | 0
Balance, at the end of the period | 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
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 | 2 |
Redemption of preference stock |  | (3)
Balance, at the end of the period | 673 | 660
Southern California Edison | Accumulated Other Comprehensive Loss |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | (19) | (20)
Net income | 0 | 0
Other comprehensive income | 2 |
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 |
Redemption of preference stock |  | 0
Balance, at the end of the period | (22) | (18)
Southern California Edison | Retained Earnings |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 9,607 | 9,433
Net income | 316 | 380
Other comprehensive income | 0 |
Other comprehensive income |  | 0
Cumulative effect of accounting changes | 5 |
Dividends declared on common stock | (212) | (191)
Dividends declared on preferred and preference stock | (30) | (31)
Stock-based compensation | (2) | (23)
Noncash stock-based compensation | 0 |
Redemption of preference stock |  | 0
Balance, at the end of the period | 9,684 | 9,568
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
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 |
Redemption of preference stock |  | 0
Balance, at the end of the period | $ 2,245 | $ 2,245

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