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Employee Benefit Plans - Benefit Payments for BNY Mellons Pension and Healthcare Plans Expected to be Paid (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Domestic pension benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 $ 258
2018 268
2019 251
2020 253
2021 258
2022-2026 1,289
Total pension benefits 2,577
Foreign pension benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 12
2018 15
2019 16
2020 15
2021 19
2022-2026 110
Total pension benefits 187
Domestic Healthcare Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 13
2018 13
2019 13
2020 13
2021 13
2022-2026 56
Total pension benefits 121
Foreign Healthcare Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2017 0
2018 0
2019 0
2020 0
2021 0
2022-2026 1
Total pension benefits $ 1