Subsequent Event - Detail of fixed maturity investments held by subsidiaries to be disposed (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	$ 43,207	$ 46,505
Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	34,123
U.S. government agency
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	242	209
U.S. government agency | Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	44
State and municipal
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	5,733	6,963
State and municipal | Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	3,421
Debt Security, Government, Non-US [Member]
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	211	172
Debt Security, Government, Non-US [Member] | Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	35
Residential MBS
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	3,055	3,160
Residential MBS | Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	2,140
Commercial MBS
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	790	927
Commercial MBS | Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	698
Collateralized loan obligations | Managed by third parties
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	4,553	4,280
Collateralized loan obligations | Managed by third parties | Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	3,491
Other asset-backed securities
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	7,223	7,128
Other asset-backed securities | Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	5,176
Corporate and other
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	21,400	23,666
Corporate and other | Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	19,118
Total fixed maturities
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	43,207	$ 46,505
Total fixed maturities | Great American Life Insurance Company
Subsequent Event [Line Items]
Available for sale (AFS) fixed maturities	$ 34,123