Subsequent Event - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Net investment income	$ 2,132	$ 2,303	$ 2,094
Investments accounted for using the equity method	1,881	1,688
Great American Life Insurance Company
Subsequent Event [Line Items]
Net investment income	1,670	1,774	1,618
Investments accounted for using the equity method	646
Great American Life Insurance Company | Directly owned real estate
Subsequent Event [Line Items]
Net investment income	49	$ 37	$ 37
Directly owned real estate	97
Great American Life Insurance Company | Equity in earnings of partnerships and similar investments
Subsequent Event [Line Items]
Investments accounted for using the equity method	$ 430