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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