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			9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	$ 102		$ (6)	$ (86)		$ (21)
MBS with embedded derivatives | Realized gains (losses) on securities
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	3		(3)	15		(8)
Public company warrants | Realized gains (losses) on securities
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	(1)		1	(1)		0
Fixed-indexed and variable-indexed annuities (embedded derivative) | Annuity benefits
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	70	[1]	(223)	(643)	[1]	(286)	[1]
Equity index call options | Annuity benefits
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	30		219	544		271
Equity index put options | Annuity benefits
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	0		0	1		0
Reinsurance contracts (embedded derivative) | Net investment income
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Derivative	$ 0		$ 0	$ (2)		$ 2

[1] The change in fair value of the embedded derivative includes a favorable adjustment related to the unlocking of actuarial assumptions of $181 million in the third quarter of 2019 and a loss of $44 million in the second quarter of 2018.