Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash flows from operating activities:
Net earnings	$ 1,879	$ 1,188
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities
Change in receivables and advance premiums	32	(34)
Capitalization of deferred policy acquisition costs	(254)	(270)
Amortization of deferred policy acquisition costs	215	205	$ 816
Increase in policy liabilities	(41)	9
Change in income tax liabilities	291	154
Net investment (gains) losses	(951)	(123)
Other, net	(322)	(239)
Net cash provided (used) by operating activities	849	890
Proceeds from investments sold or matured:
Available-for-sale fixed maturity securities	2,286	949
Equity securities	267	126
Commercial mortgage and other loans	379	418
Costs of investments acquired:
Available-for-sale fixed maturity securities	(2,127)	(1,090)
Equity securities	(73)	(134)
Commercial mortgage and other loans	(251)	(315)
Other investments, net	(2,119)	(1,256)
Settlement of derivatives, net	(256)	(480)
Cash received (pledged or returned) as collateral, net	1,973	1,756
Other, net	148	(51)
Net cash provided (used) by investing activities	227	(77)
Cash flows from financing activities:
Purchases of treasury stock	(750)	(700)
Proceeds from borrowings	823	0
Dividends paid to shareholders	(278)	(248)
Change in investment-type contracts, net	(50)	(28)
Treasury stock reissued	6	2
Other, net	(7)	41
Net cash provided (used) by financing activities	(256)	(933)
Effect of exchange rate changes on cash and cash equivalents	(28)	(14)
Net change in cash and cash equivalents	792	(134)
Cash and cash equivalents, beginning of period	4,306	3,943	3,943
Cash and cash equivalents, end of period	5,098	3,809	$ 4,306
Supplemental disclosures of cash flow information:
Income taxes paid	0	0
Interest paid	34	37
Noncash interest	13	11
Noncash real estate acquired in satisfaction of debt	35	0
Noncash financing activities:
Lease obligations	5	18
Associate stock bonus
Treasury stock issued for:
Treasury stock issued	4	4
Shareholder dividend reinvestment
Treasury stock issued for:
Treasury stock issued	10	9
Share-based compensation grants
Treasury stock issued for:
Treasury stock issued	$ 6	$ 5