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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Compensation and benefits expense | $ (1,829) | $ (1,642) | $ (3,834) | $ (3,567)
Other net benefit credits | (48) | (66) | (91) | (133)
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Compensation and benefits expense | 7 | 6 | 13 | 12
Other net benefit credits | (47) | (64) | (91) | (131)
Net benefit credit | (40) | $ (58) | $ (78) | $ (119)
Postretirement Benefit Costs |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Other net benefit credits | $ 1 |  |  |

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