Investments - Components of the net unrealized gain on securities that is included in AOCI in the Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Unrealized gain on:
Pretax	$ 1,220	$ 1,589
Deferred Tax	(257)	(334)
Net	963	1,255
Annuity subsidiaries | Net earnings (loss) from discontinued operations
Unrealized gain on:
Pretax	980	1,305
Deferred Tax	(206)	(274)
Net	774	1,031
Total fixed maturities
Unrealized gain on:
Pretax	240	284
Deferred Tax	(51)	(60)
Net	189	224
Fixed maturities — annuity segment | Annuity subsidiaries | Net earnings (loss) from discontinued operations
Unrealized gain on:
Pretax	1,919	2,555
Deferred Tax	(403)	(536)
Net	1,516	2,019
Deferred policy acquisition costs — annuity segment | Annuity subsidiaries | Net earnings (loss) from discontinued operations
Unrealized gain on:
Pretax	(661)	(934)
Deferred Tax	139	196
Net	(522)	(738)
Annuity benefits accumulated | Annuity subsidiaries | Net earnings (loss) from discontinued operations
Unrealized gain on:
Pretax	(283)	(324)
Deferred Tax	59	68
Net	(224)	(256)
Life, accident and health reserves | Annuity subsidiaries | Net earnings (loss) from discontinued operations
Unrealized gain on:
Pretax	(3)	(3)
Deferred Tax	1	0
Net	(2)	(3)
Unearned revenue | Annuity subsidiaries | Net earnings (loss) from discontinued operations
Unrealized gain on:
Pretax	8	11
Deferred Tax	(2)	(2)
Net	$ 6	$ 9