Strategic Initiatives - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	36 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2022
Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected period for completion of restructuring plan			3 years
Restructuring charges	$ 41	$ 72
Allocated restructuring costs from affiliates	30	53
Restructuring Plan | Occupancy Expense, Net | Lease Termination and Associated Costs
Restructuring Cost and Reserve [Line Items]
Reversal of right-of-use asset and leasehold improvement impairment charges	4	3
HSBC Group Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Allocated restructuring costs from affiliates	$ 25	$ 42