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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]        
Compensation and benefits expense $ (1,899) $ (1,829) $ (3,653) $ (3,834)
Other net benefit credits (50) (48) (100) (91)
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Compensation and benefits expense 7 7 13 13
Other net benefit credits (52) (47) (103) (91)
Net benefit cost (credit) (45) (40) (90) $ (78)
Postretirement Benefit Costs        
Defined Benefit Plan Disclosure [Line Items]        
Other net benefit credits $ 2 $ 1 $ 3