Annual report pursuant to Section 13 and 15(d)

Federal Funds Sold or Purchased, Securities Financing Agreements and Short-term Borrowings - Narrative (Details)

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Federal Funds Sold or Purchased, Securities Financing Agreements and Short-term Borrowings - Narrative (Details) - Subsidiaries - Bank of America, N.A. - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]    
Minimum maturity period 7 days  
Debt Instrument, Registration Statement, Short-Term Debt Outstanding Under Program $ 14.2 $ 9.3
Bank Notes    
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]    
Debt authorized $ 75.0