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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Compensation and benefits expense (Operating income) | $ (467) | $ (541) | $ (2,085) | $ (2,140)
Other net benefit (credits) cost | (69) | (63) | (203) | (194)
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Compensation and benefits expense (Operating income) | 10 | 8 | 28 | 25
Other net benefit (credits) cost | (69) | (63) | (203) | (194)
Total (credit) cost | (59) | (55) | (175) | (169)
Post-retirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Compensation and benefits expense (Operating income) | 0 | 1 | 0 | 1
Other net benefit (credits) cost | 0 | 0 | 0 | 0
Total (credit) cost | $ 0 | $ 1 | $ 0 | $ 1

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