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Investments (Rating info) (Details 4) - Ameriprise Financial [Member] - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Investments    
Percentage of GNMA, FNMA and FHLMC securities rated AAA 41.00% 47.00%
Number of holdings of other than GNMA, FNMA, and FHLMC having greater than 10% of total equity 0 0
AAA [Member]    
Investments    
Amortized cost $ 10,444 $ 9,252
Fair value $ 10,528 $ 9,305
Percent of total fair value 34.00% 31.00%
AA [Member]    
Investments    
Amortized cost $ 1,914 $ 1,729
Fair value $ 2,132 $ 1,906
Percent of total fair value 7.00% 6.00%
A [Member]    
Investments    
Amortized cost $ 4,986 $ 5,157
Fair value $ 5,453 $ 5,567
Percent of total fair value 18.00% 18.00%
BBB [Member]    
Investments    
Amortized cost $ 10,745 $ 11,739
Fair value $ 11,435 $ 12,340
Percent of total fair value 37.00% 40.00%
Below investment grade [Member]    
Investments    
Amortized cost [1] $ 1,220 $ 1,585
Fair value [1] $ 1,259 $ 1,579
Percent of total fair value 4.00% 5.00%
Total fixed maturities [Member]    
Investments    
Amortized cost $ 29,309 $ 29,462
Fair value $ 30,807 $ 30,697
Percent of total fair value 100.00% 100.00%
Interest in CLOs managed by the Company [Member] | Below investment grade [Member]    
Investments    
Amortized cost $ 6 $ 9
Fair value $ 11 $ 14
[1] The amortized cost and fair value of below investment grade securities includes interest in CLOs managed by the Company of $6 million and $11 million, respectively, at September 30, 2017, and $9 million and $14 million, respectively, at December 31, 2016. These securities are not rated but are included in below investment grade due to their risk characteristics.