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Significant accounting policies and practices (Tables) | 12 Months Ended
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Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of reclassifications to amounts previously reported | These reclassifications conform presentations of balances in 2023 for comparability to current year presentations. Amounts are in millions.
| December 31, 2023 |
| As previously reported |  |  | Reclassification |  |  | As reclassified |
Assets: |  |  |  |  |  |  |  |
Insurance and Other: |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 33,672 |  |  | $ | 596 |  |  | $ | 34,268 |
Other receivables |  | 44,174 |  |  |  | 2,087 |  |  |  | 46,261 |
Inventories |  | 24,159 |  |  |  | 1,697 |  |  |  | 25,856 |
Property, plant and equipment |  | 22,030 |  |  |  | 8,169 |  |  |  | 30,199 |
Goodwill |  | 50,868 |  |  |  | 6,605 |  |  |  | 57,473 |
Other intangible assets |  | 29,327 |  |  |  | 6,557 |  |  |  | 35,884 |
Other |  | 19,568 |  |  |  | 2,298 |  |  |  | 21,866 |
Railroad, Utilities and Energy: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 4,350 |  |  |  | (596 | ) |  |  | 3,754 |
Receivables |  | 7,086 |  |  |  | (2,087 | ) |  |  | 4,999 |
Property, plant and equipment |  | 177,616 |  |  |  | (8,169 | ) |  |  | 169,447 |
Goodwill |  | 33,758 |  |  |  | (6,605 | ) |  |  | 27,153 |
Other |  | 30,397 |  |  |  | (10,552 | ) |  |  | 19,845 |
Liabilities: |  |  |  |  |  |  |  |
Insurance and Other: |  |  |  |  |  |  |  |
Accounts payable, accruals and other liabilities |  | 32,402 |  |  |  | 4,157 |  |  |  | 36,559 |
Notes payable and other borrowings |  | 42,692 |  |  |  | 5,776 |  |  |  | 48,468 |
Railroad, Utilities and Energy: |  |  |  |  |  |  |  |
Accounts payable, accruals and other liabilities |  | 22,461 |  |  |  | (4,157 | ) |  |  | 18,304 |
Notes payable and other borrowings |  | 85,579 |  |  |  | (5,776 | ) |  |  | 79,803 |
| Year ended December 31, 2023 |
| As previously reported |  |  | Reclassification |  |  | As reclassified |
Revenues: |  |  |  |  |  |  |  |
Insurance and Other: |  |  |  |  |  |  |  |
Sales and service revenues | $ | 155,687 |  |  | $ | 51,461 |  |  | $ | 207,148 |
Interest, dividend and other investment income |  | 15,561 |  |  |  | 203 |  |  |  | 15,764 |
Railroad, Utilities and Energy: |  |  |  |  |  |  |  |
Utility and energy operating revenues |  | 72,693 |  |  |  | (51,461 | ) |  |  | 21,232 |
Service revenues and other income |  | 4,931 |  |  |  | (203 | ) |  |  | 4,728 |
Costs and expenses: |  |  |  |  |  |  |  |
Insurance and Other: |  |  |  |  |  |  |  |
Cost of sales and services |  | 122,569 |  |  |  | 46,712 |  |  |  | 169,281 |
Selling, general and administrative expenses |  | 22,605 |  |  |  | 2,853 |  |  |  | 25,458 |
Interest expense |  | 1,258 |  |  |  | 413 |  |  |  | 1,671 |
Railroad, Utilities and Energy: |  |  |  |  |  |  |  |
Utilities and energy cost of sales and other expenses |  | 67,964 |  |  |  | (49,565 | ) |  |  | 18,399 |
Interest expense |  | 3,745 |  |  |  | (413 | ) |  |  | 3,332 |

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- Definition Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483443/250-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483443/250-10-50-7 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483443/250-10-50-9 + Details
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