Variable Interest Entities (Textual) (Details) - Southern California Edison	3 Months Ended			9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares MW	Mar. 31, 2016 $ / shares	Sep. 30, 2015 USD ($) MW	Sep. 30, 2016 USD ($) $ / shares MW	Sep. 30, 2015 USD ($) MW	Dec. 31, 2015 USD ($) $ / shares
Series K Preferred Stock
Variable Interest Entity
Security dividend rate, (as a percent)		5.45%
Liquidation value (in dollars per share) | $ / shares		$ 2,500
Variable Interest Entity, Not Primary Beneficiary | SCE Power Purchase Contracts
Variable Interest Entity
Power generating capacity (in megawatts) | MW	4,349		4,062	4,349	4,062
Payments to unconsolidated VIEs for power purchase contracts	$ 313,000,000		$ 270,000,000	$ 532,000,000	$ 451,000,000
Variable Interest Entity, Not Primary Beneficiary | Trust I
Variable Interest Entity
Common stock	10,000			$ 10,000		$ 10,000
Variable Interest Entity, Not Primary Beneficiary | Trust I | Trust Securities
Variable Interest Entity
Security dividend rate, (as a percent)				5.625%
Liquidation preference	$ 475,000,000			$ 475,000,000		$ 475,000,000
Liquidation value (in dollars per share) | $ / shares	$ 25			$ 25		$ 25
Common stock	$ 10,000			$ 10,000
Variable Interest Entity, Not Primary Beneficiary | Trust I | Series F Preferred Stock
Variable Interest Entity
Security dividend rate, (as a percent)				5.625%
Liquidation preference	$ 475,000,000			$ 475,000,000		$ 475,000,000
Liquidation value (in dollars per share) | $ / shares	$ 2,500			$ 2,500
Variable Interest Entity, Not Primary Beneficiary | Trust II
Variable Interest Entity
Common stock	$ 10,000			$ 10,000		10,000
Variable Interest Entity, Not Primary Beneficiary | Trust II | Trust Securities
Variable Interest Entity
Security dividend rate, (as a percent)				5.10%
Liquidation preference	$ 400,000,000			$ 400,000,000		$ 400,000,000
Liquidation value (in dollars per share) | $ / shares	$ 25			$ 25		$ 25
Variable Interest Entity, Not Primary Beneficiary | Trust II | Series G Preferred Stock
Variable Interest Entity
Security dividend rate, (as a percent)				5.10%
Liquidation preference	$ 400,000,000			$ 400,000,000		$ 400,000,000
Liquidation value (in dollars per share) | $ / shares	$ 2,500			$ 2,500
Variable Interest Entity, Not Primary Beneficiary | Trust III
Variable Interest Entity
Common stock	$ 10,000			$ 10,000		10,000
Variable Interest Entity, Not Primary Beneficiary | Trust III | Trust Securities
Variable Interest Entity
Security dividend rate, (as a percent)				5.75%
Liquidation preference	$ 275,000,000			$ 275,000,000		$ 275,000,000
Liquidation value (in dollars per share) | $ / shares	$ 25			$ 25		$ 25
Variable Interest Entity, Not Primary Beneficiary | Trust III | Series H Preferred Stock
Variable Interest Entity
Security dividend rate, (as a percent)				5.75%
Liquidation preference	$ 275,000,000			$ 275,000,000		$ 275,000,000
Liquidation value (in dollars per share) | $ / shares	$ 2,500			$ 2,500
Variable Interest Entity, Not Primary Beneficiary | Trust IV
Variable Interest Entity
Common stock	$ 10,000			$ 10,000		10,000
Variable Interest Entity, Not Primary Beneficiary | Trust IV | Trust Securities
Variable Interest Entity
Security dividend rate, (as a percent)				5.375%
Liquidation preference	$ 325,000,000			$ 325,000,000		$ 325,000,000
Liquidation value (in dollars per share) | $ / shares	$ 25			$ 25		$ 25
Variable Interest Entity, Not Primary Beneficiary | Trust IV | Series J Preferred Stock
Variable Interest Entity
Security dividend rate, (as a percent)				0.05%
Liquidation preference	$ 325,000,000			$ 325,000,000		$ 325,000,000
Liquidation value (in dollars per share) | $ / shares	$ 2,500			$ 2,500
Variable Interest Entity, Not Primary Beneficiary | Trust V
Variable Interest Entity
Common stock	$ 10,000			$ 10,000
Variable Interest Entity, Not Primary Beneficiary | Trust V | Trust Securities
Variable Interest Entity
Security dividend rate, (as a percent)				5.45%
Liquidation preference	$ 300,000,000			$ 300,000,000
Liquidation value (in dollars per share) | $ / shares	$ 25			$ 25
Common stock	$ 10,000			$ 10,000
Variable Interest Entity, Not Primary Beneficiary | Trust V | Series K Preferred Stock
Variable Interest Entity
Security dividend rate, (as a percent)				5.45%
Liquidation preference	$ 300,000,000			$ 300,000,000
Liquidation value (in dollars per share) | $ / shares	$ 2,500			$ 2,500