Derivatives - Gain (loss) included in the Statement of Earnings for changes in the fair value of derivatives that do not qualify for hedge accounting (Details) - Not designated as hedging instrument - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	$ 75	$ 19
MBS with embedded derivatives | Realized gains (losses) on securities
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	(2)	1
MBS with embedded derivatives | Net earnings (loss) from discontinued operations | Annuity subsidiaries
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	0	3
Fixed-indexed and variable-indexed annuities (embedded derivative) | Net earnings (loss) from discontinued operations | Annuity subsidiaries
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	(40)	647
Call option | Net earnings (loss) from discontinued operations | Annuity subsidiaries
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	114	(628)
Equity index put options | Net earnings (loss) from discontinued operations | Annuity subsidiaries
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	2	(6)
Reinsurance contract (embedded derivative) | Net earnings (loss) from discontinued operations | Annuity subsidiaries
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	$ 1	$ 2