Investments Investments (EITF info-Fair value) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value [Line Items]
Less than 12 months	$ 3,368	$ 10,445
12 months or more	2,186	6,322
Total	5,554	16,767
Corporate debt securities [Member]
Fair Value [Line Items]
Less than 12 months	135	5,522
12 months or more	407	1,717
Total	542	7,239
Residential mortgage backed securities [Member]
Fair Value [Line Items]
Less than 12 months	1,933	2,029
12 months or more	1,201	2,132
Total	3,134	4,161
Commercial mortgage backed securities [Member]
Fair Value [Line Items]
Less than 12 months	1,054	2,062
12 months or more	278	1,806
Total	1,332	3,868
Asset backed securities [Member]
Fair Value [Line Items]
Less than 12 months	237	491
12 months or more	195	396
Total	432	887
State and municipal obligations [Member]
Fair Value [Line Items]
Less than 12 months	4	255
12 months or more	79	254
Total	83	509
Foreign government bonds and obligations [Member]
Fair Value [Line Items]
Less than 12 months	5	86
12 months or more	26	17
Total	$ 31	$ 103