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) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]    
Maturity period (greater than) 7 days  
Bank of America, N.A.    
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]    
Short-term bank notes outstanding $ 16,800,000,000 $ 14,600,000,000
Bank Notes | Bank of America, N.A.    
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]    
Debt authorized $ 75,000,000,000