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Other comprehensive income (loss) - Changes in AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period $ 44,428 [1]     $ 41,677  
Net change [2] 184 $ 572 $ 1,038 1,300 $ 1,031
Balance at end of period [1] 44,250 44,428 42,283 44,250 42,283
Foreign currency translation          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period (1,402) (1,827) (1,963) (2,031) (1,842)
Net change (57) 425 285 572 164
Balance at end of period (1,459) (1,402) (1,678) (1,459) (1,678)
Accumulated Defined Benefits Adjustment | Pension Plan          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period (1,332) (1,337) (1,335) (1,344) (1,343)
Net change 5 5 4 17 12
Balance at end of period (1,327) (1,332) (1,331) (1,327) (1,331)
Accumulated Defined Benefits Adjustment | Other post-retirement benefits          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period (41) (42) (42) (36) (40)
Net change 1 1 (2) (4) (4)
Balance at end of period (40) (41) (44) (40) (44)
Unrealized gain (loss) on assets available-for-sale          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period (768) (907) (1,563) (1,240) (1,669)
Net change 246 139 751 718 857
Balance at end of period (522) (768) (812) (522) (812)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-For-Sale Securities Transferred To Held-To-Maturity, After Consideration Of Hedge And Taxes          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Net change (10) (7) 23    
Unrealized gain (loss) on cash flow hedges          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period (6) (2) 3 (5) 1
Net change (8) (4) (5) (9) (3)
Balance at end of period (14) (6) (2) (14) (2)
Total accumulated other comprehensive income (loss), net of tax          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance at beginning of period (3,549) (4,115) (4,900) (4,656) (4,893)
Net change 187 566 1,033 1,294 1,026
Balance at end of period $ (3,362) $ (3,549) $ (3,867) $ (3,362) $ (3,867)
[1] Includes total The Bank of New York Mellon Corporation common shareholders’ equity of $39,043 million at Sept. 30, 2025, $38,619 million at June 30, 2025 and $37,649 million at Sept. 30, 2024.
[2] Other comprehensive income attributable to The Bank of New York Mellon Corporation shareholders was $187 million for the quarter ended Sept. 30, 2025, $566 million for the quarter ended June 30, 2025, $1,033 million for the quarter ended Sept. 30, 2024, $1,294 million for the nine months ended Sept. 30, 2025 and $1,026 million for the nine months ended Sept. 30, 2024.