Investments Continuous Unrealized Loss Position (Details) - Ameriprise Financial [Member] $ in Millions	Mar. 31, 2021 USD ($) Positions	Dec. 31, 2020 USD ($) Positions
Number of securities
Less than 12 months | Positions	233	153
12 months or more | Positions	122	122
Total | Positions	355	275
Fair Value
Less than 12 months	$ 4,931	$ 2,193
12 months or more	965	1,046
Total	5,896	3,239
Unrealized Losses
Less than 12 months	(115)	(17)
12 months or more	(7)	(17)
Total	$ (122)	$ (34)
Available -for-Sale Securities with gross unrealized losses considered investment grade (as a percent)	88.00%	92.00%
Corporate debt securities [Member]
Number of securities
Less than 12 months | Positions	84	26
12 months or more | Positions	4	11
Total | Positions	88	37
Fair Value
Less than 12 months	$ 1,948	$ 228
12 months or more	23	19
Total	1,971	247
Unrealized Losses
Less than 12 months	(86)	(1)
12 months or more	(1)	(1)
Total	$ (87)	$ (2)
Residential mortgage backed securities [Member]
Number of securities
Less than 12 months | Positions	63	72
12 months or more | Positions	77	71
Total | Positions	140	143
Fair Value
Less than 12 months	$ 1,861	$ 833
12 months or more	297	391
Total	2,158	1,224
Unrealized Losses
Less than 12 months	(16)	(2)
12 months or more	(1)	(2)
Total	$ (17)	$ (4)
Commercial mortgage backed securities [Member]
Number of securities
Less than 12 months | Positions	43	35
12 months or more | Positions	18	19
Total | Positions	61	54
Fair Value
Less than 12 months	$ 778	$ 781
12 months or more	428	393
Total	1,206	1,174
Unrealized Losses
Less than 12 months	(10)	(11)
12 months or more	(2)	(10)
Total	$ (12)	$ (21)
Asset backed securities [Member]
Number of securities
Less than 12 months | Positions	11	17
12 months or more | Positions	14	13
Total | Positions	25	30
Fair Value
Less than 12 months	$ 265	$ 344
12 months or more	203	231
Total	468	575
Unrealized Losses
Less than 12 months	(1)	(3)
12 months or more	(1)	(2)
Total	$ (2)	$ (5)
State and municipal obligations [Member]
Number of securities
Less than 12 months | Positions	28	2
12 months or more | Positions	2	1
Total | Positions	30	3
Fair Value
Less than 12 months	$ 74	$ 4
12 months or more	7	4
Total	81	8
Unrealized Losses
Less than 12 months	(2)	0
12 months or more	(1)	(1)
Total	$ (3)	$ (1)
Foreign government bonds and obligations [Member]
Number of securities
Less than 12 months | Positions	4	1
12 months or more | Positions	7	7
Total | Positions	11	8
Fair Value
Less than 12 months	$ 5	$ 3
12 months or more	7	8
Total	12	11
Unrealized Losses
Less than 12 months	0	0
12 months or more	(1)	(1)
Total	$ (1)	$ (1)