Debt - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Total Interest Expense	$ 54	$ 35	$ 110	$ 70
Asset Management
Debt Instrument [Line Items]
Total Interest Expense	31	35	63	70
Retirement Services
Debt Instrument [Line Items]
Total Interest Expense	$ 23	$ 0	$ 47	$ 0