Compensation and Benefit Plans (Stock Option Activity) (Details) - Stock options $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Stock Options
Beginning balance (in shares) | shares	9,278,677
Grants (in shares) | shares	1,993,954
Forfeited or expired (in shares) | shares	(203,340)
Exercised (in shares) | shares	(359,908)
Ending balance (in shares) | shares	10,709,383
Vested and expected to vest (in shares) | shares	10,391,796
Exercisable (in shares) | shares	6,489,876
Exercise Price
Beginning balance, weighted average exercise price (in dollars per share) | $ / shares	$ 62.27
Granted, weighted average exercise price (in dollars per share) | $ / shares	68.60
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares	65.75
Exercised, weighted average exercise price (in dollars per share) | $ / shares	48.59
Ending balance, weighted average exercise price (in dollars per share) | $ / shares	63.85
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	63.60
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 62.08
Remaining Contractual Term (Years)
Outstanding (term)	6 years 10 days
Vested and expected to vest (term)	6 years 2 months 1 day
Exercisable (term)	4 years 9 months 29 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2020 | $	$ 30
Exercisable at December 31, 2020 | $	27
Exercise of option, tax benefit | $	$ 2
SCE
Stock Options
Beginning balance (in shares) | shares	4,934,702
Grants (in shares) | shares	1,053,923
Forfeited or expired (in shares) | shares	(189,691)
Exercised (in shares) | shares	(302,911)
Transfers, net (in shares) | shares	(5,535)
Ending balance (in shares) | shares	5,490,488
Vested and expected to vest (in shares) | shares	5,325,052
Exercisable (in shares) | shares	3,361,238
Exercise Price
Beginning balance, weighted average exercise price (in dollars per share) | $ / shares	$ 61.01
Granted, weighted average exercise price (in dollars per share) | $ / shares	68.27
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares	65.75
Exercised, weighted average exercise price (in dollars per share) | $ / shares	49.49
Transfers, net, weighted average exercise price (in dollars per share) | $ / shares	63.36
Ending balance, weighted average exercise price (in dollars per share) | $ / shares	62.85
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	62.50
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 60.41
Remaining Contractual Term (Years)
Outstanding (term)	5 years 10 months 9 days
Vested and expected to vest (term)	5 years 11 months 23 days
Exercisable (term)	4 years 6 months 21 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2020 | $	$ 20
Exercisable at December 31, 2020 | $	19
Exercise of option, tax benefit | $	$ 2