Subsequent Event - Assets and liabilities of businesses to be disposed (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Cash and cash equivalents	$ 2,810	$ 2,314	$ 1,515	$ 2,338
Available for sale (AFS) fixed maturities	43,207	46,505
Trading fixed maturities	66	113
Equity securities, at fair value	1,663	1,937
Investments accounted for using the equity method	1,881	1,688
Mortgage loans	1,623	1,329
Policy loans	151	164
Equity index call options	825	924
Other investments	276	278
Cash and investments	52,502	55,252
Agents’ balances and premiums receivable	1,231	1,335
Deferred policy acquisition costs	546	1,037	1,682	$ 1,216
Variable annuity assets (separate accounts)	664	628
Other assets	1,626	1,867
Total assets	73,566	70,130	$ 63,456
Annuity benefits accumulated	42,573	40,406
Life, accident and health reserves	607	612
Variable annuity liabilities (separate accounts)	664	628
Other liabilities	2,197	2,295
Total liabilities	66,777	63,861
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,273	863
Shareholders’ equity	6,789	$ 6,269
Great American Life Insurance Company
Subsequent Event [Line Items]
Cash and cash equivalents	1,679
Available for sale (AFS) fixed maturities	34,123
Trading fixed maturities	42
Equity securities, at fair value	774
Investments accounted for using the equity method	646
Mortgage loans	1,251
Policy loans	151
Equity index call options	825
Other investments	199
Cash and investments	39,690
Recoverables from reinsurers	6,804
Agents’ balances and premiums receivable	5
Deferred policy acquisition costs	303
Variable annuity assets (separate accounts)	664
Other assets	968
Total assets	48,434
Annuity benefits accumulated	42,573
Life, accident and health reserves	607
Variable annuity liabilities (separate accounts)	664
Other liabilities	620
Total liabilities	44,464
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,071)
Shareholders’ equity	$ 2,899