Basis of Presentation - Out of Period Correction (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Out-of-period corrections
Other comprehensive income (loss), net of tax	$ (361)		$ 122		$ (530)	$ 254
Management and financial advice fees
Out-of-period corrections
Revenue from contracts with customers	$ (2,367)		$ (1,893)		$ (6,720)	$ (5,365)
Correction related to defined benefit plans
Out-of-period corrections
Other comprehensive income (loss), net of tax		$ 29
Correction related to performance fees | Management and financial advice fees
Out-of-period corrections
Revenue from contracts with customers				$ 19