Compensation and Benefit Plans (Stock Option Activity) (Details) (Employee Stock Option, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Weighted Average Exercise Price [Roll Forward]
Beginning balance, weighted average exercise price (dollars per share)	$ 37.96
Granted, weighted average exercise price (dollars per share)	$ 48.46
Expired, weighted average exercise price (dollars per share)	$ 49.69
Forfeited, weighted average exercise price (dollars per share)	$ 42.55
Exercised, weighted average exercise price (dollars per share)	$ 34.54
Ending balance, weighted average exercise price (dollars per share)	$ 40.22
Vested and expected to vest, weighted average exercise price (dollars per share)	$ 40.13
Exercisable, weighted average exercise price (dollars per share)	$ 38.26
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (number of options)	19,231,723
Grants (number of options)	2,778,766
Expired (number of options)	(158,107)
Forfeited (number of options)	(540,782)
Exercised (number of options)	(4,084,755)
Ending balance (number of options)	17,226,845
Vested and expected to vest (number of options)	16,715,413
Exercisable (number of options)	10,118,484
Weighted Average Remaining Contractual Term Years [Abstract]
Outstanding balance, weighted average remaining contractual term (years)	5 years 9 months 10 days
Vested and expected to vest, weighted average remaining contractual term (years)	5 years 8 months 15 days
Exercisable, weighted average remaining contractual term (years)	4 years 2 months 26 days
Aggregate Intrinsic Value [Abstract]
Vested and expected to vest, aggregate intrinsic value	$ 115
Exercisable, aggregate intrinsic value	88
Southern California Edison
Weighted Average Exercise Price [Roll Forward]
Beginning balance, weighted average exercise price (dollars per share)	$ 37.73
Granted, weighted average exercise price (dollars per share)	$ 48.48
Expired, weighted average exercise price (dollars per share)	$ 49.63
Forfeited, weighted average exercise price (dollars per share)	$ 43.47
Exercised, weighted average exercise price (dollars per share)	$ 34.94
Transfers, net, weighted average exercise price (dollars per share)	$ 36.67
Ending balance, weighted average exercise price (dollars per share)	$ 40.28
Vested and expected to vest, weighted average exercise price (dollars per share)	$ 40.17
Exercisable, weighted average exercise price (dollars per share)	$ 37.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (number of options)	10,308,461
Grants (number of options)	1,792,688
Expired (number of options)	(97,000)
Forfeited (number of options)	(402,548)
Exercised (number of options)	(2,643,487)
Transfers, net (number of options)	87,884
Ending balance (number of options)	9,045,998
Vested and expected to vest (number of options)	8,737,930
Exercisable (number of options)	5,080,978
Weighted Average Remaining Contractual Term Years [Abstract]
Outstanding balance, weighted average remaining contractual term (years)	5 years 11 months 1 day
Vested and expected to vest, weighted average remaining contractual term (years)	5 years 10 months 2 days
Exercisable, weighted average remaining contractual term (years)	4 years 3 months 14 days
Aggregate Intrinsic Value [Abstract]
Vested and expected to vest, aggregate intrinsic value	60
Exercisable, aggregate intrinsic value	$ 46