Investments Investments (EITF info-Fair value) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value [Line Items]
Less than 12 months	$ 2,193	$ 6,637
12 months or more	1,046	1,936
Total	3,239	8,573
Corporate debt securities [Member]
Fair Value [Line Items]
Less than 12 months	228	66
12 months or more	19	173
Total	247	239
Residential mortgage backed securities [Member]
Fair Value [Line Items]
Less than 12 months	833	4,328
12 months or more	391	1,164
Total	1,224	5,492
Commercial mortgage backed securities [Member]
Fair Value [Line Items]
Less than 12 months	781	1,622
12 months or more	393	314
Total	1,174	1,936
Asset backed securities [Member]
Fair Value [Line Items]
Less than 12 months	344	598
12 months or more	231	213
Total	575	811
State and municipal obligations [Member]
Fair Value [Line Items]
Less than 12 months	4	23
12 months or more	4	57
Total	8	80
Foreign government bonds and obligations [Member]
Fair Value [Line Items]
Less than 12 months	3	0
12 months or more	8	15
Total	$ 11	$ 15