Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details) - USD ($) $ in Millions		12 Months Ended
	May 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		$ 926	$ 3,706	$ 3,841
Total realized/unrealized gains (losses) included in Net earnings		24	181	(42)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(53)	(27)	69
Purchases and issuances		338	636	781
Sales and settlements		(117)	(565)	(606)
Transfer into Level 3		72	66	620
Transfer out of Level 3		(88)	(352)	(957)
Sale of annuity business	$ (2,719)
Financial assets, Ending Balance		1,102	926	3,706
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value		(25)	(23)	(3,933)	$ (3,730)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings		0	(223)	(283)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)		0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances		(2)	(169)	(242)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements		0	159	322
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3		0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3		0	0	0
Sale of annuity business	4,143
Annuity subsidiaries | Liabilities of discontinued annuity operations
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value			0	(3,933)	$ (3,730)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings			(223)	(283)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)			0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances			(146)	(242)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements			159	322
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3			0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3			0	0
Sale of annuity business	4,143
Fixed maturities
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		600	538	571
Total realized/unrealized gains (losses) included in Net earnings		0	(3)	(7)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(53)	(5)	10
Purchases and issuances		223	344	174
Sales and settlements		(93)	(210)	(157)
Transfer into Level 3		68	33	108
Transfer out of Level 3		(81)	(97)	(161)
Sale of annuity business	0
Financial assets, Ending Balance		664	600	538
U.S. government agency
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		0	0	0
Total realized/unrealized gains (losses) included in Net earnings		0	0	0
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	0	0
Purchases and issuances		0	0	0
Sales and settlements		0	0	0
Transfer into Level 3		0	0	0
Transfer out of Level 3		0	0	0
Sale of annuity business	0
Financial assets, Ending Balance		0	0	0
State and municipal
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		41	39	40
Total realized/unrealized gains (losses) included in Net earnings		0	0	0
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(3)	0	1
Purchases and issuances		0	0	0
Sales and settlements		(1)	(4)	(2)
Transfer into Level 3		4	8	0
Transfer out of Level 3		(36)	(2)	0
Sale of annuity business	0
Financial assets, Ending Balance		5	41	39
Residential MBS
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		14	38	45
Total realized/unrealized gains (losses) included in Net earnings		0	(4)	(1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(1)	0	(1)
Purchases and issuances		0	6	0
Sales and settlements		(1)	(3)	(6)
Transfer into Level 3		7	6	9
Transfer out of Level 3		(10)	(29)	(8)
Sale of annuity business	0
Financial assets, Ending Balance		9	14	38
Commercial MBS
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		0	2	6
Total realized/unrealized gains (losses) included in Net earnings		0	0	0
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	0	0
Purchases and issuances		0	0	0
Sales and settlements		0	0	0
Transfer into Level 3		0	0	1
Transfer out of Level 3		0	(2)	(5)
Sale of annuity business	0
Financial assets, Ending Balance		0	0	2
Collateralized loan obligations
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		0	16	1
Total realized/unrealized gains (losses) included in Net earnings		0	1	0
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	0	5
Purchases and issuances		0	0	0
Sales and settlements		0	(2)	0
Transfer into Level 3		2	0	52
Transfer out of Level 3		0	(15)	(42)
Sale of annuity business	0
Financial assets, Ending Balance		2	0	16
Other asset-backed securities
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		278	305	256
Total realized/unrealized gains (losses) included in Net earnings		1	1	(7)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(27)	0	5
Purchases and issuances		94	154	106
Sales and settlements		(52)	(156)	(89)
Transfer into Level 3		35	14	42
Transfer out of Level 3		0	(40)	(8)
Sale of annuity business	0
Financial assets, Ending Balance		329	278	305
Corporate and other
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		267	138	223
Total realized/unrealized gains (losses) included in Net earnings		(1)	(1)	1
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(22)	(5)	0
Purchases and issuances		129	184	68
Sales and settlements		(39)	(45)	(60)
Transfer into Level 3		20	5	4
Transfer out of Level 3		(35)	(9)	(98)
Sale of annuity business	0
Financial assets, Ending Balance		319	267	138
Equity securities
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		313	176	161
Total realized/unrealized gains (losses) included in Net earnings		29	99	(12)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	0	0
Purchases and issuances		112	78	37
Sales and settlements		(24)	(28)	(7)
Transfer into Level 3		4	0	9
Transfer out of Level 3		(7)	(12)	(12)
Sale of annuity business	0
Financial assets, Ending Balance		427	313	176
Assets of MIE
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		13	21	17
Total realized/unrealized gains (losses) included in Net earnings		(5)	0	(6)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	0	0
Purchases and issuances		3	5	2
Sales and settlements		0	0	0
Transfer into Level 3		0	1	8
Transfer out of Level 3		0	(14)	0
Sale of annuity business	0
Financial assets, Ending Balance		11	13	21
Assets of discontinued annuity operations | Annuity subsidiaries
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		$ 0	2,971	3,092
Total realized/unrealized gains (losses) included in Net earnings			85	(17)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)			(22)	59
Purchases and issuances			209	568
Sales and settlements			(327)	(442)
Transfer into Level 3			32	495
Transfer out of Level 3			(229)	(784)
Sale of annuity business	$ (2,719)
Financial assets, Ending Balance			$ 0	$ 2,971