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Retirement Benefits (Schedule Of Defined Benefit Plan Net Periodic Benefit Cost Amounts Recorded in Consolidated Statement of Income) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Compensation and benefits expense | $ (1,925) | $ (1,726)
Other net benefit credits | (67) | (58)
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Compensation and benefits expense | 6 | 6
Other net benefit credits | (67) | (58)
Net benefit credit | $ (61) | $ (52)

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