Segment Information - Reportable Segments and Total Assets (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	4
Summary of assets by segment
Total assets	$ 167,525	$ 175,979
Advice & Wealth Management
Summary of assets by segment
Total assets	26,752	24,986
Asset Management
Summary of assets by segment
Total assets	10,457	10,990
Retirement & Protection Solutions
Summary of assets by segment
Total assets	112,881	119,469
Corporate & Other
Summary of assets by segment
Total assets	$ 17,435	$ 20,534