Annual report [Section 13 and 15(d), not S-K Item 405]

Commitments and Contingencies - Deposit Insurance Assessment (Details)

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Commitments and Contingencies - Deposit Insurance Assessment (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Bank of America, N.A. | FDIC Deposit Insurance Assessments | Insurance-related Assessments  
Loss Contingencies [Line Items]  
Loss contingency, damages sought $ 1,120