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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Compensation and benefits expense (Operating income) | $ (540) | $ (467) | $ (2,495) | $ (2,085)
Other net benefit (credits) cost | (60) | (69) | (187) | (203)
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Compensation and benefits expense (Operating income) | 10 | 10 | 27 | 28
Other net benefit (credits) cost | (60) | (69) | (187) | (203)
Total (credit) cost | (50) | (59) | (160) | (175)
Post-retirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Compensation and benefits expense (Operating income) | 0 | 0 | 0 | 0
Other net benefit (credits) cost | 0 | 0 | 0 | 0
Total (credit) cost | $ 0 | $ 0 | $ 0 | $ 0

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