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Retirement Benefits (Amounts Recorded in the Consolidated Statements of Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits expense (Operating income) | $ (571) | $ (540) | $ (885) | $ (1,070) | $ (592) | $ (467) | $ (680) | $ (938) | $ (3,066) | $ (2,677) | $ (2,761)
Other net benefit (credit) cost |  |  |  |  |  |  |  |  | (257) | (265) | (215)
Pension Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits expense (Operating income) |  |  |  |  |  |  |  |  | 36 | 31 | 34
Other net benefit (credit) cost |  |  |  |  |  |  |  |  | (258) | (265) | (215)
Total (credit) cost |  |  |  |  |  |  |  |  | (222) | (234) | (181)
Post-retirement Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits expense (Operating income) |  |  |  |  |  |  |  |  | 0 | 0 | 1
Other net benefit (credit) cost |  |  |  |  |  |  |  |  | 1 | 0 | 0
Total (credit) cost |  |  |  |  |  |  |  |  | $ 1 | $ 0 | $ 1

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