Investments (Realized GL Info) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Investments
Gross realized gains	$ 4	$ 6		$ 17	$ 28
Gross realized losses		(1)		(3)	(13)
Credit Losses		15	$ 5	$ 14	20
Gross Realized Gain (Loss)	$ 4	$ (10)			$ (5)

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration