Long-term Debt - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 57,013	$ 52,420	$ 64,278
Repayments of long-term debt, net of adjustments	47,100	50,600
Long-term debt	262,934	240,856
Bank of America Corporation
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	43,766	29,315	$ 30,708
Repayments of long-term debt, net of adjustments	22,600	21,100
Long-term debt	233,081	199,909
Subsidiaries
Debt Instrument [Line Items]
Repayments of long-term debt, net of adjustments	13,000	9,600
Long-term debt	17,558	20,789
Subsidiaries | Bank of America, N.A.
Debt Instrument [Line Items]
Repayments of long-term debt, net of adjustments	11,500	19,900
Long-term debt	12,295	20,158
Consolidated VIEs
Debt Instrument [Line Items]
Long-term debt	7,053	$ 8,718
Financial Guarantee
Debt Instrument [Line Items]
Debt outstanding, unconditionally guaranteed	$ 4,800
Long Term Debt, Excluding Senior Structured Notes
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	3.02%	3.26%
Fixed Rate Debt
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	3.29%	3.55%
Floating Rate Debt
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	0.71%	1.92%
Credit card | Consolidated VIEs
Debt Instrument [Line Items]
Long-term debt	$ 6,273	$ 8,372
Residential mortgage | Consolidated VIEs
Debt Instrument [Line Items]
Long-term debt	491
Home equity | Consolidated VIEs
Debt Instrument [Line Items]
Long-term debt	178	64
Other Variable Interest Entities and Resecuritization Trusts | Consolidated VIEs
Debt Instrument [Line Items]
Long-term debt	111
2020 Long-Term Debt Notes
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	56,900
2020 Long-Term Debt Notes | Bank of America Corporation
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	43,800
2020 Long-Term Debt Notes | Subsidiaries
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	8,300
2020 Long-Term Debt Notes | Subsidiaries | Bank of America, N.A.
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	4,800
2019 Long-Term Debt Notes
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt		52,500
2019 Long-Term Debt Notes | Bank of America Corporation
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt		29,300
2019 Long-Term Debt Notes | Subsidiaries
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt		12,300
2019 Long-Term Debt Notes | Subsidiaries | Bank of America, N.A.
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt		10,900
Foreign Currency - Dominated Debt
Debt Instrument [Line Items]
Long-term debt	$ 54,600	$ 49,600