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Retirement Benefits (Amounts Recorded in the Consolidated Statements of Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Compensation and benefits expense | $ (4,312) | $ (3,066) | $ (2,677)
Other net benefit (credit) cost | (277) | (257) | (265)
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Compensation and benefits expense | 38 | 36 | 31
Other net benefit (credit) cost | (278) | (258) | (265)
Total credit | (240) | (222) | (234)
Post-retirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Compensation and benefits expense | 1 | 0 | 0
Other net benefit (credit) cost | 1 | 1 | 0
Total credit | $ 2 | $ 1 | $ 0

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