Mortgage Servicing Rights - Additional Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Transfers and Servicing [Abstract]
Change in fair value resulting from change in valuation inputs	$ 306

Servicing Asset At Fair Value, Change in Fair Value Resulting from Change in Valuation Inputs

No definition available.

Name:	bac_ServicingAssetAtFairValueChangeinFairValueResultingfromChangeinValuationInputs
Namespace Prefix:	bac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration