Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023		Jun. 30, 2022
Cash flows from operating activities:
Net earnings (loss)	$ 71,956		$ (37,537)
Adjustments to reconcile net earnings to operating cash flows:
Investment (gains) losses	(67,819)		68,589
Depreciation and amortization	6,147		5,413
Other	(3,126)		(2,592)
Changes in operating assets and liabilities:
Unpaid losses and loss adjustment expenses	275		1,505
Deferred charges - retroactive reinsurance	416		426
Unearned premiums	2,492		2,384
Receivables and originated loans	(1,194)		(6,455)
Inventories	505		(4,080)
Other assets	(980)		(620)
Other liabilities	(2,721)		1,247
Income taxes	15,176		(12,923)
Net cash flows from operating activities	21,127		15,357
Cash flows from investing activities:
Purchases of equity securities	(7,442)		(57,269)
Sales of equity securities	25,833		12,044
Purchases of U.S. Treasury Bills and fixed maturity securities	(99,060)		(100,355)
Sales of U.S. Treasury Bills and fixed maturity securities	39,991		54,637
Redemptions and maturities of U.S. Treasury Bills and fixed maturity securities	59,815		23,681
Acquisitions of businesses, net of cash acquired	(8,516)		(103)
Purchases of property, plant and equipment and equipment held for lease	(8,398)		(6,833)
Other	513		25
Net cash flows from investing activities	2,736		(74,173)
Cash flows from financing activities:
Changes in short term borrowings, net	582		(85)
Acquisition of treasury stock	(5,850)		(4,191)
Other, principally transactions with noncontrolling interests	(803)		(1,464)
Net cash flows from financing activities	(9,633)		1,607
Effects of foreign currency exchange rate changes	24		(273)
Increase (decrease) in cash and cash equivalents and restricted cash	14,254		(57,482)
Cash and cash equivalents and restricted cash at beginning of year	36,399		88,706
Cash and cash equivalents and restricted cash at end of second quarter	50,653		31,224
Restricted cash, included in other assets at beginning of year	588		522
Restricted cash, included in other assets at end of second quarter	$ 598		$ 616
Restricted Cash and Cash Equivalents, Asset, Statement of Financial Position [Extensible List]	Other		Other
Insurance and Other [Member]
Cash flows from financing activities:
Proceeds from borrowings	$ 1,225		$ 6,972
Repayments of borrowings	(5,388)		(1,440)
Cash and cash equivalents at beginning of year	32,260	[1]	85,319
Cash and cash equivalents at end of second quarter	44,611	[1]	26,534
Railroad, Utilities and Energy [Member]
Cash flows from financing activities:
Proceeds from borrowings	2,788		3,189
Repayments of borrowings	(2,187)		(1,374)
Cash and cash equivalents at beginning of year	3,551	[1]	2,865
Cash and cash equivalents at end of second quarter	$ 5,444	[1]	$ 4,074

[1] Includes U.S. Treasury Bills with maturities of three months or less when purchased of $24.5 billion at June 30, 2023 and $2.6 billion at December 31, 2022.