v3.26.3
Retirement Benefits (Defined Benefit Plan Net Periodic Benefit Cost Amounts Recorded in Consolidated Statement of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Defined Benefit Plan Disclosure [Line Items]        
Compensation and benefits expense $ (1,215) $ (1,170) $ (4,868) $ (5,004)
Other net benefit credits (48) (52) (148) (143)
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Compensation and benefits expense 6 8 19 21
Other net benefit credits (48) (52) (151) (143)
Net benefit cost (credit) $ (42) $ (44) (132) $ (122)
Postretirement Benefit Costs        
Defined Benefit Plan Disclosure [Line Items]        
Other net benefit credits     $ 3