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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, 2015
USD ($)
Domestic Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2016 $ 252
2017 267
2018 254
2019 250
2020 253
2021-2025 1,275
Total pension benefits 2,551
Foreign Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2016 16
2017 15
2018 17
2019 17
2020 20
2021-2025 116
Total pension benefits 201
Domestic Healthcare Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2016 14
2017 14
2018 14
2019 14
2020 14
2021-2025 62
Total pension benefits 132
Foreign Healthcare Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2016 0
2017 0
2018 0
2019 0
2020 0
2021-2025 1
Total pension benefits $ 1