Strategic Initiatives - Expected Charges (Details) - Restructuring Plan $ in Millions	Sep. 30, 2022 USD ($)
Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	$ 800
Minimum | Wealth and Personal Banking
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	148
Minimum | Commercial Banking
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	16
Minimum | Markets and Securities Services
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	80
Minimum | Global Banking and Markets Other
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	14
Minimum | Corporate Center
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	542
Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	840
Maximum | Wealth and Personal Banking
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	154
Maximum | Commercial Banking
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	18
Maximum | Markets and Securities Services
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	82
Maximum | Global Banking and Markets Other
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	16
Maximum | Corporate Center
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges, pre-tax	$ 570