Investments (Realized GL Info) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Investments
Gross realized gains	$ 8	$ 19
Gross realized losses	(3)	(9)
Credit losses	(13)	(5)
Gross Realized Gain (Loss)	$ (8)	$ 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