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Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | $ 14,187 | $ 13,388
Net income | 393 | 311
Net income | 392 | 306
Other comprehensive income (loss) | 4 | 2
Dividends declared on common stock | (177) | (156)
Dividends to noncontrolling interests | (31) | (30)
Stock-based compensation | (139) | (8)
Non-cash stock-based compensation | 5 | 6
Issuance of preference stock |  | 294
Redemption of preference stock |  | (125)
Balance, at the end of the period | $ 14,242 | $ 13,682
Dividends declared per common share (in dollars per share) | $ 0.5425 | $ 0.4800
Accounting for Share-Based Payments |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Net income |  | $ 271
Stock-based compensation |  | (50)
Common Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | $ 2,505 | 2,484
Non-cash stock-based compensation | 5 | 6
Balance, at the end of the period | 2,510 | 2,490
Accumulated Other Comprehensive Loss |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | (53) | (56)
Other comprehensive income (loss) | 4 | 2
Balance, at the end of the period | (49) | (54)
Retained Earnings |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 9,544 | 8,940
Net income | 362 | 281
Dividends declared on common stock | (177) | (156)
Stock-based compensation | (139) | (8)
Redemption of preference stock |  | (3)
Balance, at the end of the period | 9,590 | 9,054
Subtotal |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 11,996 | 11,368
Net income | 362 | 281
Other comprehensive income (loss) | 4 | 2
Dividends declared on common stock | (177) | (156)
Stock-based compensation | (139) | (8)
Non-cash stock-based compensation | 5 | 6
Redemption of preference stock |  | (3)
Balance, at the end of the period | 12,051 | 11,490
Preferred and Preference Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 2,191 | 2,020
Net income | 31 | 30
Dividends to noncontrolling interests | (31) | (30)
Issuance of preference stock |  | 294
Redemption of preference stock |  | (122)
Balance, at the end of the period | 2,191 | 2,192
Southern California Edison |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 14,483 | 13,672
Net income | 380 | 325
Other comprehensive income (loss) | 2 | 1
Dividends declared on common stock | (191) | (170)
Dividends declared on preferred and preference stock | (31) | (30)
Stock-based compensation | (23) | (28)
Non-cash stock-based compensation | 3 | 3
Issuance of preference stock |  | 294
Redemption of preference stock |  | (125)
Balance, at the end of the period | 14,623 | 13,942
Southern California Edison | Accounting for Share-Based Payments |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Net income |  | 317
Stock-based compensation |  | (34)
Southern California Edison | Common stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 2,168 | 2,168
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 | 657 | 652
Non-cash stock-based compensation | 3 | 3
Issuance of preference stock |  | (6)
Redemption of preference stock |  | 3
Balance, at the end of the period | 660 | 652
Southern California Edison | Accumulated Other Comprehensive Loss |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | (20) | (22)
Other comprehensive income (loss) | 2 | 1
Balance, at the end of the period | (18) | (21)
Southern California Edison | Retained Earnings |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 9,433 | 8,804
Net income | 380 | 325
Dividends declared on common stock | (191) | (170)
Dividends declared on preferred and preference stock | (31) | (30)
Stock-based compensation | (23) | (28)
Redemption of preference stock |  | (3)
Balance, at the end of the period | 9,568 | 8,898
Southern California Edison | Preferred and Preference Stock |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance, at the beginning of the period | 2,245 | 2,070
Issuance of preference stock |  | 300
Redemption of preference stock |  | (125)
Balance, at the end of the period | $ 2,245 | $ 2,245

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