Derivatives - Credit-related Contingent Features and Collateral (Details) $ in Millions	Mar. 31, 2023 USD ($)
Derivative [Line Items]
Additional collateral required to be posted upon downgrade, one incremental notch	$ 162
Additional collateral required to be posted upon downgrade, second incremental notch	908
Credit derivatives
Derivative [Line Items]
Derivative liability subject to unilateral termination upon downgrade, one incremental notch	79
Derivative liability subject to unilateral termination upon downgrade, second incremental notch	600
Collateral posted subject to unilateral termination upon downgrade, one incremental notch	60
Collateral posted subject to unilateral termination upon downgrade, second incremental notch	306
Bank of America, N.A.
Derivative [Line Items]
Additional collateral required to be posted upon downgrade, one incremental notch	70
Additional collateral required to be posted upon downgrade, second incremental notch	$ 647