Compensation and Benefit Plans (Stock Option Activity) (Details) - Stock options $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Stock options
Beginning balance (number of options) | shares	12,866,597
Grants (number of options) | shares	2,120,009
Expired (number of options) | shares	0
Forfeited (number of options) | shares	(274,166)
Exercised (number of options) | shares	(3,167,939)
Ending balance (number of options) | shares	11,544,501
Vested and expected to vest (number of options) | shares	11,437,110
Exercisable (number of options) | shares	7,685,341
Exercise Price
Beginning balance, weighted average exercise price (dollars per share) | $ / shares	$ 45.93
Granted, weighted average exercise price (dollars per share) | $ / shares	67.41
Expired, weighted average exercise price (dollars per share) | $ / shares	0.00
Forfeited, weighted average exercise price (dollars per share) | $ / shares	64.02
Exercised, weighted average exercise price (dollars per share) | $ / shares	42.93
Ending balance, weighted average exercise price (dollars per share) | $ / shares	50.26
Vested and expected to vest, weighted average exercise price (dollars per share) | $ / shares	50.12
Exercisable, weighted average exercise price (dollars per share) | $ / shares	$ 43.99
Remaining Contractual Term (Years)
Outstanding at December 31, 2016 (term)	6 years 7 days
Vested and expected to vest at December 31, 2016 (term)	5 years 11 months 27 days
Exercisable at December 31, 2016 (term)	4 years 11 months 5 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2016 | $	$ 250
Exercisable at December 31, 2016 | $	$ 215
SCE
Stock options
Beginning balance (number of options) | shares	5,840,057
Grants (number of options) | shares	959,478
Expired (number of options) | shares	0
Forfeited (number of options) | shares	(120,842)
Exercised (number of options) | shares	(1,705,053)
Transfers, net (number of options) | shares	(246,224)
Ending balance (number of options) | shares	4,727,416
Vested and expected to vest (number of options) | shares	4,667,784
Exercisable (number of options) | shares	2,782,770
Exercise Price
Beginning balance, weighted average exercise price (dollars per share) | $ / shares	$ 47.77
Granted, weighted average exercise price (dollars per share) | $ / shares	67.36
Expired, weighted average exercise price (dollars per share) | $ / shares	0.00
Forfeited, weighted average exercise price (dollars per share) | $ / shares	61.96
Exercised, weighted average exercise price (dollars per share) | $ / shares	44.59
Transfers, net, weighted average exercise price (dollars per share) | $ / shares	59.29
Ending balance, weighted average exercise price (dollars per share) | $ / shares	51.81
Vested and expected to vest, weighted average exercise price (dollars per share) | $ / shares	51.63
Exercisable, weighted average exercise price (dollars per share) | $ / shares	$ 44.04
Remaining Contractual Term (Years)
Outstanding at December 31, 2016 (term)	6 years 2 months 27 days
Vested and expected to vest at December 31, 2016 (term)	6 years 2 months 16 days
Exercisable at December 31, 2016 (term)	4 years 10 months 2 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2016 | $	$ 95
Exercisable at December 31, 2016 | $	$ 78