Compensation and Benefit Plans (Stock Option Activity) (Details) - Stock options $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options | $	$ 3
Stock options
Beginning balance (number of options) | shares	7,822,565
Grants (number of options) | shares	1,785,538
Forfeited or expired (number of options) | shares	(222,392)
Exercised (number of options) | shares	(552,101)
Ending balance (number of options) | shares	8,833,610
Vested and expected to vest (number of options) | shares	8,726,445
Exercisable (number of options) | shares	5,145,292
Exercise Price
Beginning balance, weighted average exercise price (dollars per share) | $ / shares	$ 58.98
Granted, weighted average exercise price (dollars per share) | $ / shares	60.83
Forfeited or expired, weighted average exercise price (dollars per share) | $ / shares	69.59
Exercised, weighted average exercise price (dollars per share) | $ / shares	47.33
Ending balance, weighted average exercise price (dollars per share) | $ / shares	59.81
Vested and expected to vest, weighted average exercise price (dollars per share) | $ / shares	59.76
Exercisable, weighted average exercise price (dollars per share) | $ / shares	$ 54.77
Remaining Contractual Term (Years)
Outstanding at December 31, 2016 (term)	6 years 1 month 17 days
Vested and expected to vest at December 31, 2016 (term)	6 years 1 month 6 days
Exercisable at December 31, 2016 (term)	4 years 8 months 27 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2018 | $	$ 34
Exercisable at December 31, 2018 | $	34
SCE
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options | $	$ 2
Stock options
Beginning balance (number of options) | shares	4,445,702
Grants (number of options) | shares	960,240
Forfeited or expired (number of options) | shares	(125,260)
Exercised (number of options) | shares	(288,302)
Transfers, net (number of options) | shares	44,805
Ending balance (number of options) | shares	5,037,185
Vested and expected to vest (number of options) | shares	4,982,445
Exercisable (number of options) | shares	3,089,466
Exercise Price
Beginning balance, weighted average exercise price (dollars per share) | $ / shares	$ 56.46
Granted, weighted average exercise price (dollars per share) | $ / shares	60.86
Forfeited or expired, weighted average exercise price (dollars per share) | $ / shares	68.90
Exercised, weighted average exercise price (dollars per share) | $ / shares	41.57
Transfers, net, weighted average exercise price (dollars per share) | $ / shares	55.74
Ending balance, weighted average exercise price (dollars per share) | $ / shares	57.84
Vested and expected to vest, weighted average exercise price (dollars per share) | $ / shares	57.77
Exercisable, weighted average exercise price (dollars per share) | $ / shares	$ 52.15
Remaining Contractual Term (Years)
Outstanding at December 31, 2016 (term)	5 years 9 months 15 days
Vested and expected to vest at December 31, 2016 (term)	5 years 9 months
Exercisable at December 31, 2016 (term)	4 years 3 months 29 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2018 | $	$ 25
Exercisable at December 31, 2018 | $	$ 25