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Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | $ 13,388 | $ 12,982
Net income |  |  | 1,057 | 1,183
Net income | $ 449 | $ 448 | 1,048 | 1,172
Other comprehensive income (loss) | 2 | 1 | 5 | 3
Dividends declared on common stock |  |  | (469) | (408)
Dividends to noncontrolling interests |  |  | (92) | (84)
Stock-based compensation |  |  | (71) | (67)
Non-cash stock-based compensation |  |  | 18 | 17
Issuance of preference stock |  |  | 294 | 319
Redemption of preference stock |  |  | (125) | (325)
Balance, at the end of the period | $ 14,005 | $ 13,620 | $ 14,005 | $ 13,620
Dividends declared per common share (in dollars per share) | $ 0.4800 | $ 0.4175 | $ 1.4400 | $ 1.2525
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | $ 2,484 | $ 2,445
Stock-based compensation |  |  | 1 | 13
Non-cash stock-based compensation |  |  | 18 | 17
Balance, at the end of the period | $ 2,503 | $ 2,475 | 2,503 | 2,475
Accumulated Other Comprehensive Loss |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | (56) | (58)
Other comprehensive income (loss) |  |  | 5 | 3
Balance, at the end of the period | (51) | (55) | (51) | (55)
Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 8,940 | 8,573
Net income |  |  | 965 | 1,099
Dividends declared on common stock |  |  | (469) | (408)
Stock-based compensation |  |  | (72) | (80)
Redemption of preference stock |  |  | (2) | (4)
Balance, at the end of the period | 9,362 | 9,180 | 9,362 | 9,180
Subtotal |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 11,368 | 10,960
Net income |  |  | 965 | 1,099
Other comprehensive income (loss) |  |  | 5 | 3
Dividends declared on common stock |  |  | (469) | (408)
Stock-based compensation |  |  | (71) | (67)
Non-cash stock-based compensation |  |  | 18 | 17
Redemption of preference stock |  |  | (2) | (4)
Balance, at the end of the period | 11,814 | 11,600 | 11,814 | 11,600
Preferred and Preference Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 2,020 | 2,022
Net income |  |  | 92 | 84
Dividends to noncontrolling interests |  |  | (92) | (84)
Issuance of preference stock |  |  | 294 | 319
Redemption of preference stock |  |  | (123) | (321)
Balance, at the end of the period | 2,191 | 2,020 | 2,191 | 2,020
Southern California Edison |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 13,672 | 13,282
Net income | 466 | 417 | 1,129 | 1,163
Other comprehensive income (loss) | 1 | 1 | 3 | 3
Dividends declared on common stock |  |  | (510) | (441)
Dividends declared on preferred and preference stock |  |  | (92) | (84)
Stock-based compensation |  |  | (47) | (3)
Non-cash stock-based compensation |  |  | 8 | 10
Issuance of preference stock |  |  | 294 | 319
Redemption of preference stock |  |  | (125) | (325)
Balance, at the end of the period | 14,332 | 13,924 | 14,332 | 13,924
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 |  |  | 652 | 618
Stock-based compensation |  |  | 2 | 28
Non-cash stock-based compensation |  |  | 8 | 10
Issuance of preference stock |  |  | (6) | (6)
Redemption of preference stock |  |  | 2 | 4
Balance, at the end of the period | 658 | 654 | 658 | 654
Southern California Edison | Accumulated Other Comprehensive Loss |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | (22) | (28)
Other comprehensive income (loss) |  |  | 3 | 3
Balance, at the end of the period | (19) | (25) | (19) | (25)
Southern California Edison | Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 8,804 | 8,454
Net income |  |  | 1,129 | 1,163
Dividends declared on common stock |  |  | (510) | (441)
Dividends declared on preferred and preference stock |  |  | (92) | (84)
Stock-based compensation |  |  | (49) | (31)
Redemption of preference stock |  |  | (2) | (4)
Balance, at the end of the period | 9,280 | 9,057 | 9,280 | 9,057
Southern California Edison | Preferred and Preference Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, at the beginning of the period |  |  | 2,070 | 2,070
Issuance of preference stock |  |  | 300 | 325
Redemption of preference stock |  |  | (125) | (325)
Balance, at the end of the period | $ 2,245 | $ 2,070 | $ 2,245 | $ 2,070

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