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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net earnings $ 47,993 $ 69,810
Adjustments to reconcile net earnings to operating cash flows:    
Investment (gains) losses (21,868) (46,247)
Depreciation and amortization 9,927 9,572
Discount accretion on investments, principally U.S. Treasury Bills (8,846) (7,880)
Other 7,107 699
Changes in operating assets and liabilities:    
Unpaid losses and loss adjustment expenses 2,589 2,885
Deferred charges - retroactive reinsurance 499 610
Unearned premiums 2,583 2,510
Receivables and originated loans (5,930) (1,747)
Inventories (1,013) 232
Other assets (676) (1,549)
Other liabilities 1,229 (1,729)
Income taxes 1,183 (1,195)
Net cash flows from operating activities 34,777 25,971
Cash flows from investing activities:    
Purchases of equity securities (13,447) (5,809)
Sales of equity securities 24,046 133,218
Purchases of U.S. Treasury Bills and fixed maturity securities (444,370) (385,224)
Sales of U.S. Treasury Bills and fixed maturity securities 29,238 30,755
Redemptions and maturities of U.S. Treasury Bills and fixed maturity securities 412,821 226,901
Purchases of property, plant and equipment and equipment held for lease (14,725) (13,629)
Other 342 (767)
Net cash flows from investing activities (6,095) (14,555)
Cash flows from financing activities:    
Changes in short term borrowings, net 628 (3,407)
Acquisitions of treasury stock   (2,918)
Other, principally transactions with noncontrolling interests (730) (4,984)
Net cash flows from financing activities (278) (12,013)
Effects of foreign currency exchange rate changes 331 (54)
Increase (decrease) in cash and cash equivalents and restricted cash 28,735 (651)
Cash and cash equivalents and restricted cash at the beginning of the year 48,376 38,643
Cash and cash equivalents and restricted cash at the end of the third quarter 77,111 37,992
Restricted cash included in other assets at the beginning of the year 647 621
Restricted cash included in other assets at the end of the third quarter $ 805 $ 811
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 $ 1,734 $ 2,689
Repayments of borrowings (2,672) (7,761)
Cash and cash equivalents at beginning of the year 44,333 [1] 34,268
Cash and cash equivalents at the end of the third quarter 72,156 [1] 32,605
Railroad, Utilities and Energy [Member]    
Cash flows from financing activities:    
Proceeds from borrowings 4,015 6,617
Repayments of borrowings (3,253) (2,249)
Cash and cash equivalents at beginning of the year 3,396 [1] 3,754
Cash and cash equivalents at the end of the third quarter $ 4,150 [1] $ 4,576
[1] Includes U.S. Treasury Bills with maturities of three months or less when purchased of $38.4 billion at September 30, 2025 and $14.4 billion at December 31, 2024.