Fair Values of Assets and Liabilities (Financial Instruments not at FV) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Financial Assets
Mortgage loans, net	$ 2,665	$ 2,655
Policy loans	855	867
Other investments	696	734
Other receivables	1,661	1,713
Financial Liabilities
Short-term borrowings	200	201
Line of credit with Ameriprise Financial	0	50
Other liabilities	7,082	5,427
Separate account liabilities - investment contracts	79,059	82,425
Carrying value [Member]
Financial Assets
Mortgage loans, net	2,665	2,655
Policy loans	855	867
Other investments	412	410
Other receivables	1,465	1,514
Financial Liabilities
Policyholder account balances, future policy benefits and claims	9,272	9,110
Short-term borrowings	200	201
Line of credit with Ameriprise Financial		50
Other liabilities	17	22
Separate account liabilities - investment contracts	314	340
Recurring basis [Member]
Financial Assets
Mortgage loans, net	2,698	2,707
Policy loans	824	810
Other investments	393	410
Other receivables	1,675	1,648
Financial Liabilities
Policyholder account balances, future policy benefits and claims	10,927	10,061
Short-term borrowings	200	201
Line of credit with Ameriprise Financial		50
Other liabilities	16	21
Separate account liabilities - investment contracts	314	340
Recurring basis [Member] | Level 2 [Member]
Financial Assets
Other investments	343	376
Financial Liabilities
Short-term borrowings	200	201
Separate account liabilities - investment contracts	314	340
Recurring basis [Member] | Level 3 [Member]
Financial Assets
Mortgage loans, net	2,698	2,707
Policy loans	824	810
Other investments	50	34
Other receivables	1,675	1,648
Financial Liabilities
Policyholder account balances, future policy benefits and claims	10,927	10,061
Line of credit with Ameriprise Financial		50
Other liabilities	$ 16	$ 21