Earnings per Share Attributable to Ameriprise Financial, Inc. Common Shareholders (Basic & Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ (539)		$ 492	$ 1,497	$ 887
Denominator:
Basic: Weighted-average common shares outstanding			136.1	125.7	137.4
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares)			1.9	1.5	1.7
Diluted: Weighted-average common shares outstanding	125.0		138.0	127.2	139.1
Basic:
Net income (in dollars per share)	$ (4.31)		$ 3.61	$ 11.91	$ 6.46
Diluted:
Net income (in dollars per share)	$ (4.31)	[1]	$ 3.57	$ 11.77	$ 6.38
Equity Option [Member]
Diluted:
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares)				1.5	1.0
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares)				1.5	1.0
Share-based Payment Arrangement [Member]
Diluted:
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares)	1.2
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares)	1.2

[1] Diluted shares used in this calculation represent basic shares due to the net loss. Using actual diluted shares would result in anti-dilution.