Fair Value - Fair Value Inputs, Assets and Liabilities, Quantitative Information (Details) - Pricing Methods with Significant Unobservable Market Inputs (Level 3) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Measurement Input, Option Volatility | Valuation Technique, Option Pricing Model | Derivative instruments, liabilities | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative liability, measurement input	0.081
Measurement Input, Option Volatility | Valuation Technique, Option Pricing Model | Derivative instruments, liabilities | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative liability, measurement input	0.192
Measurement Input, Option Volatility | Valuation Technique, Option Pricing Model | Derivative instruments, liabilities | Weighted average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative liability, measurement input	0.098	0.147
Measurement Input, Option Volatility | Valuation Technique, Option Pricing Model | Derivative instruments, assets | Minimum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative asset, measurement input	0.073
Measurement Input, Option Volatility | Valuation Technique, Option Pricing Model | Derivative instruments, assets | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative asset, measurement input	0.192
Measurement Input, Option Volatility | Valuation Technique, Option Pricing Model | Derivative instruments, assets | Weighted average
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative asset, measurement input	0.114	0.152
Significant unobservable inputs readily available to State Street:
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Total assets carried at fair value	$ 4	$ 0
Total liabilities carried at fair value	2	0
Significant unobservable inputs readily available to State Street: | Derivative instruments, liabilities
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative instruments, foreign exchange contracts, derivative asset	2	0
Significant unobservable inputs readily available to State Street: | Derivative instruments, assets
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative instruments, foreign exchange contracts, derivative asset	$ 4	$ 0