Investments (Rating info) (Details) - Ameriprise Financial [Member] $ in Millions		Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Investments
Fixed Maturity Investments Rated Internally		$ 557	$ 624
Percentage of GNMA, FNMA and FHLMC securities rated AAA		45.00%
Number of holdings of other than GNMA, FNMA, and FHLMC having greater than 10% of total equity		0	0
AAA [Member]
Investments
Amortized cost		$ 18,039	$ 18,256
Fair value		$ 17,903	$ 18,437
Percent of total fair value		56.00%	56.00%
AA [Member]
Investments
Amortized cost		$ 1,030	$ 1,113
Fair value		$ 1,204	$ 1,304
Percent of total fair value		4.00%	4.00%
A [Member]
Investments
Amortized cost		$ 3,157	$ 3,008
Fair value		$ 3,596	$ 3,474
Percent of total fair value		11.00%	10.00%
BBB [Member]
Investments
Amortized cost		$ 7,878	$ 8,178
Fair value		$ 8,144	$ 9,102
Percent of total fair value		26.00%	28.00%
Below investment grade [Member]
Investments
Amortized cost	[1]	$ 1,145	$ 777
Fair value	[1]	$ 999	$ 812
Percent of total fair value		3.00%	2.00%
Total fixed maturities [Member]
Investments
Amortized cost		$ 31,249	$ 31,332
Fair value		$ 31,846	$ 33,129
Percent of total fair value		100.00%	100.00%
Interest in CLOs managed by the Company [Member] | Below investment grade [Member]
Investments
Amortized cost		$ 5	$ 5
Fair value		$ 4	$ 6

[1] The amortized cost and fair value of below investment grade securities includes interest in CLOs managed by the Company of $5 million and $4 million, respectively, as of March 31, 2020, and $5 million and $6 million, respectively, as of December 31, 2019. These securities are not rated but are included in below investment grade due to their risk characteristics.