Derivatives - Credit-related Contingent Features and Collateral (Details) $ in Millions	Jun. 30, 2020 USD ($)
Derivative [Line Items]
Additional collateral required to be posted upon downgrade, one incremental notch	$ 337
Additional collateral required to be posted upon downgrade, second incremental notch	707
Credit derivatives
Derivative [Line Items]
Derivative liability subject to unilateral termination upon downgrade, one incremental notch	36
Derivative liability subject to unilateral termination upon downgrade, second incremental notch	1,189
Collateral posted subject to unilateral termination upon downgrade, one incremental notch	1
Collateral posted subject to unilateral termination upon downgrade, second incremental notch	920
Bank of America, N.A.
Derivative [Line Items]
Additional collateral required to be posted upon downgrade, one incremental notch	111
Additional collateral required to be posted upon downgrade, second incremental notch	$ 512