Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022		Jun. 30, 2021
Cash flows from operating activities:
Net earnings (loss)	$ (37,791)		$ 40,265
Adjustments to reconcile net earnings (loss) to operating cash flows:
Investment (gains) losses	68,589		(32,384)
Depreciation and amortization	5,413		5,345
Other	(2,586)		33
Changes in operating assets and liabilities:
Unpaid losses and loss adjustment expenses	1,505		2,357
Deferred charges - retroactive reinsurance	426		473
Unearned premiums	2,384		2,375
Receivables and originated loans	(6,372)		(4,825)
Other assets	(4,686)		(909)
Other liabilities	1,467		(664)
Income taxes	(12,988)		7,493
Net cash flows from operating activities	15,361		19,559
Cash flows from investing activities:
Purchases of equity securities	(57,269)		(3,589)
Sales of equity securities	12,044		8,596
Purchases of U.S. Treasury Bills and fixed maturity securities	(100,355)		(99,731)
Sales of U.S. Treasury Bills and fixed maturity securities	54,637		10,814
Redemptions and maturities of U.S. Treasury Bills and fixed maturity securities	23,681		77,541
Purchases of loans and finance receivables	(22)		(56)
Collections of loans and finance receivables	130		218
Acquisitions of businesses, net of cash acquired	(103)		(104)
Purchases of property, plant and equipment and equipment held for lease	(6,833)		(5,663)
Other	(83)		541
Net cash flows from investing activities	(74,173)		(11,433)
Cash flows from financing activities:
Changes in short term borrowings, net	(85)		(65)
Acquisition of treasury stock	(4,191)		(12,560)
Other	(1,464)		(339)
Net cash flows from financing activities	1,607		(13,578)
Effects of foreign currency exchange rate changes	(277)		(112)
Increase (decrease) in cash and cash equivalents and restricted cash	(57,482)		(5,564)
Cash and cash equivalents and restricted cash at beginning of year*	88,706		48,396
Cash and cash equivalents and restricted cash at end of second quarter*	31,224		42,832
Restricted cash, included in other assets at beginning of year	522		406
Restricted cash, included in other assets at end of second quarter	$ 616		$ 534
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	$ 6,972		$ 2,949
Repayments of borrowings	(1,440)		(2,481)
Cash and cash equivalents at beginning of year	85,319	[1]	44,714
Cash and cash equivalents at end of second quarter	26,534	[1]	38,924
Railroad, Utilities and Energy [Member]
Cash flows from financing activities:
Proceeds from borrowings	3,189		1,464
Repayments of borrowings	(1,374)		(2,546)
Cash and cash equivalents at beginning of year	2,865	[1]	3,276
Cash and cash equivalents at end of second quarter	$ 4,074	[1]	$ 3,374

[1] Includes U.S. Treasury Bills with maturities of three months or less when purchased of $1.4 billion at June 30, 2022 and $61.7 billion at December 31, 2021.