Basis of Presentation - Out of Period Corrections (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Out-of-period corrections
Other comprehensive income (loss), net of tax			$ (626)	$ 367	$ 553
Management and financial advice fees
Out-of-period corrections
Revenue from contracts with customers			$ (9,275)	$ (7,368)	$ (7,015)
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