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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