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Investments (Rating info) (Details) - Ameriprise Financial [Member] - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Investments    
Amortized cost $ 33,879,000,000 $ 33,601,000,000
Fair value $ 35,832,000,000 $ 36,283,000,000
Percent of total fair value 100.00% 100.00%
Percentage of GNMA, FNMA and FHLMC securities rated AAA 32.00% 33.00%
Investment holdings of single issuer other than GNMA, FNMA and FHLMC greater than 10% of shareholders equity $ 0 $ 0
AAA [Member]    
Investments    
Amortized cost 19,922,000,000 19,815,000,000
Fair value $ 20,255,000,000 $ 20,253,000,000
Percent of total fair value 56.00% 56.00%
AA [Member]    
Investments    
Amortized cost $ 1,140,000,000 $ 1,082,000,000
Fair value $ 1,319,000,000 $ 1,312,000,000
Percent of total fair value 4.00% 3.00%
A [Member]    
Investments    
Amortized cost $ 2,714,000,000 $ 2,953,000,000
Fair value $ 3,141,000,000 $ 3,534,000,000
Percent of total fair value 9.00% 10.00%
BBB [Member]    
Investments    
Amortized cost $ 8,792,000,000 $ 8,271,000,000
Fair value $ 9,681,000,000 $ 9,542,000,000
Percent of total fair value 27.00% 26.00%
Below investment grade [Member]    
Investments    
Amortized cost $ 1,311,000,000 [1] $ 1,480,000,000
Fair value $ 1,436,000,000 [1] $ 1,642,000,000
Percent of total fair value 4.00% 5.00%
Interest in CLOs managed by the Company [Member] | Below investment grade [Member]    
Investments    
Amortized cost $ 1,000,000 $ 3,000,000
Fair value $ 1,000,000 $ 3,000,000
[1] Both the amortized cost and fair value of below investment grade securities includes interest in non-consolidated CLOs managed by the Company of $1 million as of March 31, 2021, and $3 million as of December 31, 2020. These securities are not rated but are included in below investment grade due to their risk characteristics.