Schedule II-Condensed Financial Information Of Registrant (Statement Of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net cash provided by operating activities									$ 8,399	$ 8,364	$ 10,688
Investing activities
Purchases of investments									(24,946)	(18,669)	(19,492)
Changes in securities lending collateral									(301)	(956)	(849)
Other, net									(120)	(63)	(45)
Net cash used in investing activities									(4,560)	(9,638)	(7,324)
Financing activities
Net (repayments of) proceeds from commercial paper borrowings									(300)	50	(150)
Proceeds from long-term borrowings									3,071	3,462	2,484
Repayments of long-term borrowings									(1,899)	(1,068)	(1,932)
Changes in securities lending payable									302	956	849
Repurchase and retirement of common stock									(2,316)	(1,900)	(2,700)
Cash dividends	$ (305)	$ (306)	$ (309)	$ (309)	$ (273)	$ (276)	$ (278)	$ (277)	(1,229)	(1,104)	(954)
Proceeds from issuance of common stock under employee stock plans									182	203	176
Taxes paid through withholding of common stock under employee stock plans									(93)	(102)	(128)
Other, net									41	27	2
Net cash (used in) provided by financing activities									(1,318)	423	(2,567)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect									2,507	(861)	804
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	7,387				4,880				7,387	4,880	5,741	$ 4,937
Parent Company [Member]
Operating activities
Net cash provided by operating activities									1,447	2,038	4,810
Investing activities
Purchases of investments									(367)	(2,059)	(2,729)
Proceeds from sales, maturities, calls and redemptions of investments									618	2,449	2,593
Issuance of note to subsidiary									1,500	(1,500)	0
Capitalization of subsidiaries									(411)	(807)	(2,460)
Changes in securities lending collateral									36	173	(234)
Purchases of property and equipment, net of sales									(47)	(77)	(107)
Other, net									0	0	11
Net cash used in investing activities									1,329	(1,821)	(2,926)
Financing activities
Net (repayments of) proceeds from commercial paper borrowings									(300)	50	(150)
Proceeds from long-term borrowings									3,071	3,462	2,484
Repayments of long-term borrowings									(1,899)	(1,068)	(1,932)
Changes in securities lending payable									(36)	(173)	234
Repurchase and retirement of common stock									(2,316)	(1,900)	(2,700)
Cash dividends									(1,290)	(1,158)	(1,000)
Proceeds from issuance of common stock under employee stock plans									182	203	176
Taxes paid through withholding of common stock under employee stock plans									(93)	(102)	(128)
Other, net									217	399	14
Net cash (used in) provided by financing activities									(2,464)	(287)	(3,002)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect									312	(70)	(1,118)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 942				$ 630				$ 942	$ 630	$ 700	$ 1,818