Reinsurance (Details) $ in Billions	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Fixed deferred and immediate annuity policies
Reinsurance transaction
Ceded premiums	$ 1.2	$ 1.2
Reinsurance recoverables	$ 1.1	$ 1.1
Subsidiary | RiverSource Life Insurance Company | Fixed deferred and immediate annuity policies
Reinsurance transaction
Percentage of risk reinsured	100.00%