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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