Derivatives - Credit-related Contingent Features and Collateral (Details) $ in Millions	Mar. 31, 2022 USD ($)
Derivative [Line Items]
Additional collateral required to be posted upon downgrade, one incremental notch	$ 454
Additional collateral required to be posted upon downgrade, second incremental notch	993
Credit derivatives
Derivative [Line Items]
Derivative liability subject to unilateral termination upon downgrade, one incremental notch	68
Derivative liability subject to unilateral termination upon downgrade, second incremental notch	944
Collateral posted subject to unilateral termination upon downgrade, one incremental notch	59
Collateral posted subject to unilateral termination upon downgrade, second incremental notch	604
Bank of America, N.A.
Derivative [Line Items]
Additional collateral required to be posted upon downgrade, one incremental notch	110
Additional collateral required to be posted upon downgrade, second incremental notch	$ 730