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Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | $ 14,187 | $ 13,388
Net income |  |  | 702 | 622
Net income | $ 309 | $ 308 | 701 | 614
Other comprehensive income (loss) | 1 | 1 | 5 | 3
Dividends declared on common stock |  |  | (354) | (313)
Dividends to noncontrolling interests |  |  | (62) | (61)
Stock-based compensation |  |  | (151) | (18)
Non-cash stock-based compensation |  |  | 10 | 12
Issuance of preference stock |  |  | 463 | 294
Redemption of preference stock |  |  |  | (125)
Balance, at the end of the period | $ 14,800 | $ 13,802 | $ 14,800 | $ 13,802
Dividends declared per common share (in dollars per share) | $ 0.5425 | $ 0.4800 | $ 1.0850 | $ 0.96
Accounting for Share-Based Payments |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | $ 546 |  |
Stock-based compensation |  | (60) |  |
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 |  |  | 10 | 12
Balance, at the end of the period | $ 2,515 | 2,496 | 2,515 | 2,496
Accumulated Other Comprehensive Loss |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | (53) | (56)
Other comprehensive income (loss) |  |  | 5 | 3
Balance, at the end of the period | (48) | (53) | (48) | (53)
Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 9,544 | 8,940
Net income |  |  | 640 | 561
Dividends declared on common stock |  |  | (354) | (313)
Stock-based compensation |  |  | (151) | (18)
Redemption of preference stock |  |  |  | (2)
Balance, at the end of the period | 9,679 | 9,168 | 9,679 | 9,168
Subtotal |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 11,996 | 11,368
Net income |  |  | 640 | 561
Other comprehensive income (loss) |  |  | 5 | 3
Dividends declared on common stock |  |  | (354) | (313)
Stock-based compensation |  |  | (151) | (18)
Non-cash stock-based compensation |  |  | 10 | 12
Redemption of preference stock |  |  |  | (2)
Balance, at the end of the period | 12,146 | 11,611 | 12,146 | 11,611
Preferred and Preference Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 2,191 | 2,020
Net income |  |  | 62 | 61
Dividends to noncontrolling interests |  |  | (62) | (61)
Issuance of preference stock |  |  | 463 | 294
Redemption of preference stock |  |  |  | (123)
Balance, at the end of the period | 2,654 | 2,191 | 2,654 | 2,191
Southern California Edison |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 14,483 | 13,672
Net income | 338 | 349 | 718 | 673
Other comprehensive income (loss) | 0 | 1 | 2 | 2
Dividends declared on common stock |  |  | (382) | (340)
Dividends declared on preferred and preference stock |  |  | (62) | (61)
Stock-based compensation |  |  | (33) | (34)
Non-cash stock-based compensation |  |  | 6 | 6
Issuance of preference stock |  |  | 463 | 294
Redemption of preference stock |  |  |  | (125)
Balance, at the end of the period | 15,195 | 14,087 | 15,195 | 14,087
Southern California Edison | Accounting for Share-Based Payments |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income |  | 662 |  |
Stock-based compensation |  | (40) |  |
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 | 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 |  |  | 6 | 6
Issuance of preference stock |  |  | (12) | (6)
Redemption of preference stock |  |  |  | 2
Balance, at the end of the period | 651 | 654 | 651 | 654
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 | 2
Balance, at the end of the period | (18) | (20) | (18) | (20)
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 |  |  | 718 | 673
Dividends declared on common stock |  |  | (382) | (340)
Dividends declared on preferred and preference stock |  |  | (62) | (61)
Stock-based compensation |  |  | (33) | (34)
Redemption of preference stock |  |  |  | (2)
Balance, at the end of the period | 9,674 | 9,040 | 9,674 | 9,040
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 |  |  | 475 | 300
Redemption of preference stock |  |  |  | (125)
Balance, at the end of the period | $ 2,720 | $ 2,245 | $ 2,720 | $ 2,245

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