Total Equity - Rollforward of Common Stock Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Common Stock Outstanding [Roll Forward]
Balance at beginning of period (in shares)	1,809,624,144	1,594,000,000
Treasury stock purchases (in shares)	(134,000,000)	(39,000,000)
Other (in shares)	27,000,000	22,000,000
Balance at end of period (in shares)	1,772,226,530	1,809,624,144
Eaton Vance Corp.
Common Stock Outstanding [Roll Forward]
Issuance for acquisitions (in shares)	69,000,000	0
E-TRADE
Common Stock Outstanding [Roll Forward]
Issuance for acquisitions (in shares)	0	233,000,000