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Retirement Benefits (Amounts Recorded in the Consolidated Statements of Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Compensation and benefits expense | $ (5,282) | $ (4,280) | $ (4,312)
Other net benefit (credit) cost | (239) | (235) | (277)
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Compensation and benefits expense | 23 | 28 | 38
Other net benefit (credit) cost | (237) | (237) | (278)
Net benefit (credit) cost | (214) | (209) | (240)
Post-retirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Compensation and benefits expense | 0 | 0 | 1
Other net benefit (credit) cost | (2) | 2 | 1
Net benefit (credit) cost | $ (2) | $ 2 | $ 2

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