Segment Information - Reportable Segments and Total Assets (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	4
Summary of assets by segment
Total assets	$ 179,831	$ 175,191
Advice & Wealth Management
Summary of assets by segment
Total assets	42,937	42,983
Asset Management
Summary of assets by segment
Total assets	7,045	7,288
Retirement & Protection Solutions
Summary of assets by segment
Total assets	113,392	108,451
Corporate & Other
Summary of assets by segment
Total assets	$ 16,457	$ 16,469