Employee Compensation and Benefit Plans - SVB Securities Incentive Compensation Plan and Retention Award (Details) - SVB Securities - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Jan. 31, 2019	Dec. 31, 2021
Employee Benefits Disclosure [Line Items]
Incentive Compensation Plan, percentage of compensation exceeding certain levels, settled in restricted stock units		25.00%
Incentive Compensation Plan, percentage of compensation exceeding certain levels, settled in cash		75.00%
Incentive Compensation Plan, deferred compensation vesting period		5 years
Retention pool for acquiree employees	$ 60
Retention Award, deferred portion of compensation settled in cash	50.00%
Retention Award, deferred portion of compensation settled in RSUs	50.00%
Vesting period of retention pool for acquiree employees	5 years

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