Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 1,939	$ 1,691	$ 1,984
Revenue from other sources (non-financial services revenue)	304	199	408
Total fee income and other revenue	2,243	1,890	2,392
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Receivables	339	299
Wealth Solutions
Disaggregation of Revenue [Line Items]
Revenue	497	525	650
Wealth Solutions | DistributionFeesMember
Disaggregation of Revenue [Line Items]
Revenue	121	116	207
Investment Management
Disaggregation of Revenue [Line Items]
Revenue	924	826	834
Investment Management | DistributionFeesMember
Disaggregation of Revenue [Line Items]
Revenue	146	145	183
Employee Benefits
Disaggregation of Revenue [Line Items]
Revenue	18	17	16
Benefitfocus
Disaggregation of Revenue [Line Items]
Revenue	205	0	0
Corporate
Disaggregation of Revenue [Line Items]
Revenue	$ 28	$ 62	$ 94