v3.26.1
Retirement Benefits (Defined Benefit Plan Net Periodic Benefit Cost Amounts Recorded in Consolidated Statement of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]    
Compensation and benefits expense $ (1,754) $ (2,005)
Other net benefit credits (50) (43)
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Compensation and benefits expense 6 6
Other net benefit credits (51) (44)
Net benefit cost (credit) (45) (38)
Postretirement Benefit Costs    
Defined Benefit Plan Disclosure [Line Items]    
Other net benefit credits $ 1 $ 1