Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 2,150	$ 1,939	$ 1,691
Revenue from other sources (non-financial services revenue)	386	304	199
Total fee income and other revenue	2,536	2,243	1,890
Receivables	361	339
Operating Segments | Wealth Solutions
Disaggregation of Revenue [Line Items]
Revenue	625	497	525
Operating Segments | Wealth Solutions | Distribution and shareholder servicing
Disaggregation of Revenue [Line Items]
Revenue	133	121	116
Operating Segments | Investment Management
Disaggregation of Revenue [Line Items]
Revenue	1,004	924	826
Operating Segments | Investment Management | Distribution and shareholder servicing
Disaggregation of Revenue [Line Items]
Revenue	153	146	145
Operating Segments | Health Solutions
Disaggregation of Revenue [Line Items]
Revenue	26	18	17
Operating Segments | Health Solutions | Software subscriptions and services
Disaggregation of Revenue [Line Items]
Revenue	206	205	0
Corporate
Disaggregation of Revenue [Line Items]
Revenue	$ 3	$ 28	$ 62