Subsequent Event - Results of businesses to be disposed (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Net investment income									$ 2,132	$ 2,303	$ 2,094
Realized gains (losses) on securities									289	287	(266)
Other income									204	223	223
Total revenues	$ 2,623	$ 2,060	$ 1,951	$ 1,275	$ 2,130	$ 2,123	$ 1,960	$ 2,024	7,909	8,237	7,150
Annuity benefits									1,192	1,151	998
Annuity and supplemental insurance acquisition expenses									306	253	261
Other expenses									430	441	393
Total costs and expenses									7,061	7,129	6,511
Earnings before income taxes									848	1,108	639
Provision for income taxes									127	239	122
Net earnings	$ 694	$ 164	$ 167	$ (304)	$ 191	$ 143	$ 209	$ 326	721	869	517
Great American Life Insurance Company
Subsequent Event [Line Items]
Net investment income									1,670	1,774	1,618
Realized gains (losses) on securities									364	132	(105)
Other income									126	136	139
Total revenues									2,160	2,042	1,652
Annuity benefits									1,192	1,151	998
Annuity and supplemental insurance acquisition expenses									306	253	260
Other expenses									181	180	177
Total costs and expenses									1,679	1,584	1,435
Earnings before income taxes									481	458	217
Provision for income taxes									97	94	39
Net earnings									$ 384	$ 364	$ 178