Outstanding Loans and Leases - Credit Quality Indicators, Narrative (Details) - USD ($) $ in Billions	Mar. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Commercial reservable criticized utilized exposure, amount	$ 17.4	$ 11.5
Commercial reservable criticized utilized exposure, percent	2.84%	2.09%

Commercial Reservable Criticized Utilized Exposure, Amount

No definition available.

Name:	bac_CommercialReservableCriticizedUtilizedExposureAmount
Namespace Prefix:	bac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant