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Investments (Rating info) (Details)
$ in Millions
Jun. 30, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Investments    
Fixed maturities, amortized cost $ 19,512 $ 19,111
Fixed maturities, fair value $ 21,587 $ 20,902
Percentage of securities rated AAA that were GNMA, FNMA and FHLMC 40.00% 39.00%
Number of other investment holdings other than GNMA, FNMA and FHLMC that are greater than 10% of total equity | item 0 0
Ameriprise Advisor Financing, LLC [Member]    
Investments    
Investment holdings of single issuer other than GNMA, FNMA and FHLMC greater than 10% of shareholders equity   $ 380
AAA [Member]    
Investments    
Fixed maturities, amortized cost $ 7,643 6,771
Fixed maturities, fair value $ 7,978 $ 6,950
Percent of total fair value 37.00% 33.00%
AA [Member]    
Investments    
Fixed maturities, amortized cost $ 1,077 $ 1,176
Fixed maturities, fair value $ 1,283 $ 1,374
Percent of total fair value 6.00% 7.00%
A [Member]    
Investments    
Fixed maturities, amortized cost $ 2,635 $ 2,695
Fixed maturities, fair value $ 3,162 $ 3,157
Percent of total fair value 15.00% 15.00%
BBB [Member]    
Investments    
Fixed maturities, amortized cost $ 6,992 $ 7,709
Fixed maturities, fair value $ 7,975 $ 8,626
Percent of total fair value 37.00% 41.00%
Below investment grade [Member]    
Investments    
Fixed maturities, amortized cost $ 1,165 $ 760
Fixed maturities, fair value $ 1,189 $ 795
Percent of total fair value 5.00% 4.00%
Total fixed maturities [Member]    
Investments    
Fixed maturities, amortized cost $ 19,512 $ 19,111
Fixed maturities, fair value $ 21,587 $ 20,902
Percent of total fair value 100.00% 100.00%