Compensation and Benefit Plans (Stock Option Activity) (Details) - Stock options $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Stock Options
Beginning balance (in shares) | shares	8,833,610
Grants (in shares) | shares	1,928,314
Forfeited or expired (in shares) | shares	(201,643)
Exercised (in shares) | shares	(1,281,604)
Ending balance (in shares) | shares	9,278,677
Vested and expected to vest (in shares) | shares	9,151,143
Exercisable (in shares) | shares	5,378,183
Exercise Price
Beginning balance, weighted average exercise price (in dollars per share) | $ / shares	$ 59.81
Granted, weighted average exercise price (in dollars per share) | $ / shares	62.79
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares	67.38
Exercised, weighted average exercise price (in dollars per share) | $ / shares	45.26
Ending balance, weighted average exercise price (in dollars per share) | $ / shares	62.27
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	62.27
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 60.32
Remaining Contractual Term (Years)
Outstanding at December 31, 2016 (term)	6 years 3 months 10 days
Vested and expected to vest at December 31, 2016 (term)	6 years 3 months
Exercisable at December 31, 2016 (term)	4 years 10 months 28 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2019 | $	$ 125
Exercisable at December 31, 2019 | $	84
Exercise of option, tax benefit | $	$ 7
SCE
Stock Options
Beginning balance (in shares) | shares	5,037,185
Grants (in shares) | shares	1,047,247
Forfeited or expired (in shares) | shares	(182,822)
Exercised (in shares) | shares	(878,084)
Transfers, net (in shares) | shares	(88,824)
Ending balance (in shares) | shares	4,934,702
Vested and expected to vest (in shares) | shares	4,871,685
Exercisable (in shares) | shares	2,945,726
Exercise Price
Beginning balance, weighted average exercise price (in dollars per share) | $ / shares	$ 57.84
Granted, weighted average exercise price (in dollars per share) | $ / shares	62.91
Forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares	66.83
Exercised, weighted average exercise price (in dollars per share) | $ / shares	44.67
Transfers, net, weighted average exercise price (in dollars per share) | $ / shares	53.14
Ending balance, weighted average exercise price (in dollars per share) | $ / shares	61.01
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	60.98
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 58.28
Remaining Contractual Term (Years)
Outstanding at December 31, 2016 (term)	6 years 18 days
Vested and expected to vest at December 31, 2016 (term)	6 years 3 days
Exercisable at December 31, 2016 (term)	4 years 7 months 13 days
Aggregate Intrinsic Value (in millions)
Vested and expected to vest at December 31, 2019 | $	$ 73
Exercisable at December 31, 2019 | $	52
Exercise of option, tax benefit | $	$ 5