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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, 2025 | Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Compensation and benefits expense | $ (2,005) | $ (1,925)
Other net benefit credits | (43) | (67)
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Compensation and benefits expense | 6 | 6
Other net benefit credits | (44) | (67)
Net benefit credit | (38) | (61)
Postretirement Benefit Costs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other net benefit credits | $ 1 | $ 1

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