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Investments - Available-for-Sale Securities by Type (Details) - Ameriprise Financial - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020		Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	[1]
Investments
Amortized cost	$ 28,408		$ 33,601
Gross unrealized gains	1,769		2,727
Gross unrealized losses	(62)		(34)
Allowance for Credit Loss	(1)	$ 0	(11)	[1]	$ (14)	$ (14)	$ 0
Fair value	30,114		36,283
Accrued interest excluded from amortized cost basis	144		178
Fair value of investment securities pledged to meet contractual obligations	3,000		3,600
Fair value of investment securities pledged that may be sold, pledged or rehypothecated by the counterparty	403		454
Corporate debt securities
Investments
Amortized cost	8,455		11,762
Gross unrealized gains	1,301		1,924
Gross unrealized losses	(31)		(2)
Allowance for Credit Loss	0	0	(10)	[1]	(13)	(13)	0
Fair value	9,725		13,674
Residential mortgage backed securities
Investments
Amortized cost	9,628		9,845
Gross unrealized gains	90		188
Gross unrealized losses	(19)		(4)
Fair value	9,699		10,029
Commercial mortgage backed securities
Investments
Amortized cost	4,712		5,867
Gross unrealized gains	92		242
Gross unrealized losses	(9)		(21)
Fair value	4,795		6,088
Asset backed securities
Investments
Amortized cost	3,465		3,283
Gross unrealized gains	31		52
Gross unrealized losses	(1)		(5)
Allowance for Credit Loss	0	0	(1)	[1]	$ (1)	$ (1)	$ 0
Fair value	3,495		3,329
State and municipal obligations
Investments
Amortized cost	857		1,088
Gross unrealized gains	249		297
Gross unrealized losses	(1)		(1)
Allowance for Credit Loss	(1)	$ 0	0
Fair value	1,104		1,384
U.S. government and agencies obligations
Investments
Amortized cost	1,196		1,456
Fair value	1,196		1,456
Foreign government bonds and obligations
Investments
Amortized cost	82		241
Gross unrealized gains	6		22
Gross unrealized losses	(1)		(1)
Fair value	87		262
Other securities
Investments
Amortized cost	13		59
Gross unrealized gains			2
Fair value	$ 13		$ 61
[1] Prior to January 1, 2020, credit losses on Available-for-Sale securities were not recorded in an allowance but were recorded as a reduction of the book value of the security if the security was other-than-temporarily impaired.

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