Customer Deposits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Customer Deposits [Abstract]
Amount of reserves that do not allow for a surrender charge	$ 3,200,000,000
Percentage of participation in the market index in the first option	100.00%
Percentage of participation in the market index in the second option	25.00%
Minimum [Member]
Customer Deposits [Abstract]
Amount of fixed rate investment certificates	$ 1,000
Term of fixed rate investment certificates	3 months
Returns on current first term stock market certificates (as a percent)	1.10%
Maximum [Member]
Customer Deposits [Abstract]
Amount of fixed rate investment certificates	$ 2,000,000
Term of fixed rate investment certificates	36 months
Returns on current first term stock market certificates (as a percent)	7.50%
Ameriprise Financial [Member]
Customer Deposits [Abstract]
Fixed rate certificates	$ 6,341,000,000	$ 7,032,000,000
Stock market certificates	389,000,000	456,000,000
Stock market embedded derivative reserve	8,000,000	7,000,000
Other	22,000,000	27,000,000
Less: accrued interest classified in other liabilities	(10,000,000)	(21,000,000)
Total investment certificate reserves	6,750,000,000	7,501,000,000
Brokerage customer deposits	10,891,000,000	6,929,000,000
Total	$ 17,641,000,000	$ 14,430,000,000