Investments - Available-for Sale Securities in Continuous Unrealized Loss Position (Details) - Ameriprise Financial $ in Millions	Sep. 30, 2021 USD ($) Positions	Dec. 31, 2020 USD ($) Positions
Number of securities
Less than 12 months | Positions	274	153
12 months or more | Positions	87	122
Total | Positions	361	275
Fair Value
Less than 12 months	$ 5,744	$ 2,193
12 months or more	537	1,046
Total	6,281	3,239
Unrealized Losses
Less than 12 months	(57)	(17)
12 months or more	(5)	(17)
Total	$ (62)	$ (34)
Available -for-Sale Securities with gross unrealized losses considered investment grade (as a percent)	93.00%	92000000.00%
Corporate debt securities
Number of securities
Less than 12 months | Positions	83	26
12 months or more | Positions	5	11
Total | Positions	88	37
Fair Value
Less than 12 months	$ 1,474	$ 228
12 months or more	23	19
Total	1,497	247
Unrealized Losses
Less than 12 months	(29)	(1)
12 months or more	(2)	(1)
Total	$ (31)	$ (2)
Residential mortgage backed securities
Number of securities
Less than 12 months | Positions	99	72
12 months or more | Positions	59	71
Total | Positions	158	143
Fair Value
Less than 12 months	$ 2,872	$ 833
12 months or more	195	391
Total	3,067	1,224
Unrealized Losses
Less than 12 months	(18)	(2)
12 months or more	(1)	(2)
Total	$ (19)	$ (4)
Commercial mortgage backed securities
Number of securities
Less than 12 months | Positions	57	35
12 months or more | Positions	10	19
Total | Positions	67	54
Fair Value
Less than 12 months	$ 1,026	$ 781
12 months or more	168	393
Total	1,194	1,174
Unrealized Losses
Less than 12 months	(8)	(11)
12 months or more	(1)	(10)
Total	$ (9)	$ (21)
Asset backed securities
Number of securities
Less than 12 months | Positions	12	17
12 months or more | Positions	7	13
Total | Positions	19	30
Fair Value
Less than 12 months	$ 317	$ 344
12 months or more	147	231
Total	464	575
Unrealized Losses
Less than 12 months	(1)	(3)
12 months or more		(2)
Total	$ (1)	$ (5)
State and municipal obligations
Number of securities
Less than 12 months | Positions	18	2
12 months or more | Positions		1
Total | Positions	18	3
Fair Value
Less than 12 months	$ 49	$ 4
12 months or more		4
Total	49	8
Unrealized Losses
Less than 12 months	(1)
12 months or more		(1)
Total	$ (1)	$ (1)
Foreign government bonds and obligations
Number of securities
Less than 12 months | Positions	5	1
12 months or more | Positions	6	7
Total | Positions	11	8
Fair Value
Less than 12 months	$ 6	$ 3
12 months or more	4	8
Total	10	11
Unrealized Losses
12 months or more	(1)	(1)
Total	$ (1)	$ (1)