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Investments (Rating info) (Details)
$ in Millions
Sep. 30, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Investments    
Fixed maturities, amortized cost $ 20,338 $ 19,111
Fixed maturities, fair value $ 22,619 $ 20,902
Percentage of securities rated AAA that were GNMA, FNMA and FHLMC 37.00% 39.00%
Number of other investment holdings other than GNMA, FNMA and FHLMC that are greater than 10% of total equity | item 375,000,000 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 $ 8,030 6,771
Fixed maturities, fair value $ 8,400 $ 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 $ 1,315 $ 1,374
Percent of total fair value 6.00% 7.00%
A [Member]    
Investments    
Fixed maturities, amortized cost $ 2,574 $ 2,695
Fixed maturities, fair value $ 3,118 $ 3,157
Percent of total fair value 14.00% 15.00%
BBB [Member]    
Investments    
Fixed maturities, amortized cost $ 7,088 $ 7,709
Fixed maturities, fair value $ 8,152 $ 8,626
Percent of total fair value 36.00% 41.00%
Below investment grade [Member]    
Investments    
Fixed maturities, amortized cost $ 1,569 $ 760
Fixed maturities, fair value $ 1,634 $ 795
Percent of total fair value 7.00% 4.00%
Total fixed maturities [Member]    
Investments    
Fixed maturities, amortized cost $ 20,338 $ 19,111
Fixed maturities, fair value $ 22,619 $ 20,902
Percent of total fair value 100.00% 100.00%