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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:      
Net earnings (loss) $ 97,147 $ (21,998) $ 90,949
Adjustments to reconcile net earnings (loss) to operating cash flows:      
Investment (gains) losses (74,855) 67,623 (77,576)
Depreciation and amortization 12,486 10,899 10,718
Other (6,023) (4,206) (3,382)
Changes in operating assets and liabilities:      
Unpaid losses and loss adjustment expenses 2,628 4,057 4,194
Deferred charges - retroactive reinsurance 375 769 1,802
Unearned premiums 1,854 1,861 2,306
Receivables and originated loans (1,949) (5,621) (5,864)
Inventories 1,426 (4,779) (1,862)
Other assets (1,328) (378) 154
Other liabilities 2,570 1,995 2,658
Income taxes 14,865 (12,872) 15,330
Net cash flows from operating activities 49,196 37,350 39,427 Close
Cash flows from investing activities:      
Purchases of equity securities (16,462) (67,930) (8,448)
Sales of equity securities 40,631 33,664 15,849
Purchases of U.S. Treasury Bills and fixed maturity securities (235,007) (183,922) (152,637)
Sales of U.S. Treasury Bills and fixed maturity securities 52,302 90,088 27,188
Redemptions and maturities of U.S. Treasury Bills and fixed maturity securities 153,201 66,318 160,402
Acquisitions of businesses, net of cash acquired (8,604) (10,594) (456)
Purchases of property, plant and equipment and equipment held for lease (19,409) (15,464) (13,276)
Other 685 239 770
Net cash flows from investing activities (32,663) (87,601) 29,392 Close
Cash flows from financing activities:      
Changes in short term borrowings, net 2,407 (596) (624)
Acquisitions of treasury stock (9,171) (7,854) (27,061)
Other, principally transactions with noncontrolling interests (4,147) (1,979) (695)
Net cash flows from financing activities (14,405) (1,662) (28,508) Close
Effects of foreign currency exchange rate changes 116 (394) (1) Close
Increase (decrease) in cash and cash equivalents and restricted cash 2,244 (52,307) 40,310 Close
Cash and cash equivalents and restricted cash at the beginning of the year 36,399 88,706 48,396
Cash and cash equivalents and restricted cash at the end of the year 38,643 36,399 88,706
Restricted cash, included in other assets at end of year $ 621 $ 588 $ 522
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] Other Other Other
Insurance and Other [Member]      
Cash flows from financing activities:      
Proceeds from borrowings $ 2,133 $ 7,822 $ 2,961
Repayments of borrowings (5,921) (1,502) (3,032)
Cash and cash equivalents at the end of the year 33,672 [1] 32,260 [1] 85,319
Railroad, Utilities and Energy [Member]      
Cash flows from financing activities:      
Proceeds from borrowings 5,684 4,873 3,959
Repayments of borrowings (5,390) (2,426) (4,016)
Cash and cash equivalents at the end of the year $ 4,350 [1] $ 3,551 [1] $ 2,865
[1] Includes U.S. Treasury Bills with maturities of three months or less when purchased of $4.8 billion at December 31, 2023 and $2.6 billion at December 31, 2022.