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, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		$ 3,706	$ 3,841	$ 3,521
Total realized/unrealized gains (losses) included in Net earnings		181	(42)	(10)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(27)	69	75
Purchases and issuances		636	781	1,578
Sales and settlements		(565)	(606)	(565)
Transfer into Level 3		66	620	244
Transfer out of Level 3		(352)	(957)	(1,002)
Sale of annuity business	$ (2,719)
Financial assets, Ending Balance		926	3,706	3,841
Fixed maturities
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		538	571	542
Total realized/unrealized gains (losses) included in Net earnings		(3)	(7)	1
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(5)	10	3
Purchases and issuances		344	174	323
Sales and settlements		(210)	(157)	(131)
Transfer into Level 3		33	108	61
Transfer out of Level 3		(97)	(161)	(228)
Sale of annuity business	0
Financial assets, Ending Balance		600	538	571
U.S. government agency
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		0	0	1
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	(1)
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		39	40	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	1	(1)
Purchases and issuances		0	0	0
Sales and settlements		(4)	(2)	0
Transfer into Level 3		8	0	45
Transfer out of Level 3		(2)	0	(4)
Sale of annuity business	0
Financial assets, Ending Balance		41	39	40
Residential MBS
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		38	45	37
Total realized/unrealized gains (losses) included in Net earnings		(4)	(1)	3
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	(1)	(1)
Purchases and issuances		6	0	0
Sales and settlements		(3)	(6)	(3)
Transfer into Level 3		6	9	12
Transfer out of Level 3		(29)	(8)	(3)
Sale of annuity business	0
Financial assets, Ending Balance		14	38	45
Commercial MBS
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		2	6	8
Total realized/unrealized gains (losses) included in Net earnings		0	0	1
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	1	0
Transfer out of Level 3		(2)	(5)	(3)
Sale of annuity business	0
Financial assets, Ending Balance		0	2	6
Collateralized loan obligations
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		16	1	31
Total realized/unrealized gains (losses) included in Net earnings		1	0	(1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	5	2
Purchases and issuances		0	0	0
Sales and settlements		(2)	0	0
Transfer into Level 3		0	52	3
Transfer out of Level 3		(15)	(42)	(34)
Sale of annuity business	0
Financial assets, Ending Balance		0	16	1
Other asset-backed securities
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		305	256	188
Total realized/unrealized gains (losses) included in Net earnings		1	(7)	0
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	5	0
Purchases and issuances		154	106	157
Sales and settlements		(156)	(89)	(43)
Transfer into Level 3		14	42	0
Transfer out of Level 3		(40)	(8)	(46)
Sale of annuity business	0
Financial assets, Ending Balance		278	305	256
Corporate and other
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		138	223	277
Total realized/unrealized gains (losses) included in Net earnings		(1)	1	(2)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(5)	0	3
Purchases and issuances		184	68	166
Sales and settlements		(45)	(60)	(84)
Transfer into Level 3		5	4	1
Transfer out of Level 3		(9)	(98)	(138)
Sale of annuity business	0
Financial assets, Ending Balance		267	138	223
Equity securities
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		176	161	124
Total realized/unrealized gains (losses) included in Net earnings		99	(12)	(6)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	0	0
Purchases and issuances		78	37	19
Sales and settlements		(28)	(7)	(1)
Transfer into Level 3		0	9	25
Transfer out of Level 3		(12)	(12)	0
Sale of annuity business	0
Financial assets, Ending Balance		313	176	161
Assets of MIE
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		21	17	21
Total realized/unrealized gains (losses) included in Net earnings		0	(6)	(5)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		0	0	0
Purchases and issuances		5	2	1
Sales and settlements		0	0	0
Transfer into Level 3		1	8	0
Transfer out of Level 3		(14)	0	0
Sale of annuity business	0
Financial assets, Ending Balance		13	21	17
Assets of discontinued annuity operations | Annuity subsidiaries
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Financial assets, Beginning Balance		2,971	3,092	2,834
Total realized/unrealized gains (losses) included in Net earnings		85	(17)	0
Total realized/unrealized gains (losses) included in other comprehensive income (loss)		(22)	59	72
Purchases and issuances		209	568	1,235
Sales and settlements		(327)	(442)	(433)
Transfer into Level 3		32	495	158
Transfer out of Level 3		(229)	(784)	(774)
Sale of annuity business	$ (2,719)
Financial assets, Ending Balance		$ 0	$ 2,971	$ 3,092