Fair Values of Assets and Liabilities (Financial Instruments not at FV) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Financial Assets
Mortgage loans, net		$ 2,628	$ 2,655
Policy loans		849	867
Other investments		744	734
Other receivables		1,690	1,713
Financial Liabilities
Short-term borrowings		200	201
Line of credit with Ameriprise Financial		0	50
Other liabilities		6,743	5,427
Separate account liabilities - investment contracts		81,348	82,425
Carrying value [Member]
Financial Assets
Mortgage loans, net		2,628	2,655
Policy loans		849	867
Other investments		482	410
Other receivables		1,449	1,514
Financial Liabilities
Policyholder account balances, future policy benefits and claims		9,600	9,110
Short-term borrowings		200	201
Line of credit with Ameriprise Financial			50
Other liabilities		15	22
Separate account liabilities - investment contracts		323	340
Recurring basis [Member]
Financial Assets
Mortgage loans, net		2,749	2,707
Policy loans	[1]	849	867
Other investments		471	410
Other receivables		1,734	1,648
Financial Liabilities
Policyholder account balances, future policy benefits and claims		11,300	10,061
Short-term borrowings		200	201
Line of credit with Ameriprise Financial			50
Other liabilities		15	21
Separate account liabilities - investment contracts		323	340
Recurring basis [Member] | Level 2 [Member]
Financial Assets
Policy loans	[1]	849	867
Other investments		402	376
Financial Liabilities
Short-term borrowings		200	201
Separate account liabilities - investment contracts		323	340
Recurring basis [Member] | Level 3 [Member]
Financial Assets
Mortgage loans, net		2,749	2,707
Other investments		69	34
Other receivables		1,734	1,648
Financial Liabilities
Policyholder account balances, future policy benefits and claims		11,300	10,061
Line of credit with Ameriprise Financial			50
Other liabilities		$ 15	$ 21

[1] During the third quarter of 2020, management changed the fair value methodology for policy loans from estimating future expected cash flows and discounting the cash flows at a rate based on the U.S. Treasury curve to using the carrying value as an approximation of fair value as the policy loans are fully collateralized by the cash surrender value of the underlying policies. As a result, policy loans were reclassified from Level 3 to Level 2 in the valuation hierarchy. For comparability and consistency purposes, prior period amounts were revised to reflect the current methodology and classification.