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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, 2020 | Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Compensation and benefits expense (Operating income) | $ (1,070) | $ (938)
Other net benefit (credits) cost | (64) | (64)
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Compensation and benefits expense (Operating income) | 8 | 8
Other net benefit (credits) cost | (64) | (64)
Total (credit) cost | (56) | (56)
Post-retirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Compensation and benefits expense (Operating income) | 0 | 0
Other net benefit (credits) cost | 0 | 0
Total (credit) cost | $ 0 | $ 0

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