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v3.25.1

General - Summary of Reclassifications to Amounts Previously Reported (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Costs and expenses: |  |
Interest expense | $ 1,257 | $ 1,316
Insurance and Other [Member] |  |
Revenues: |  |
Sales and service revenues | 47,815 | 49,933
Interest, dividend and other investment income | 5,632 | 4,338
Costs and expenses: |  |
Cost of sales and services | 38,551 | 40,792
Selling, general and administrative expenses | 7,681 | 5,541
Interest expense | 340 | 406
Railroad, Utilities and Energy [Member] |  |
Revenues: |  |
Utility and energy operating revenues | 5,494 | 5,233
Service revenues and other income | 878 | 1,032
Costs and expenses: |  |
Utility and energy cost of sales and other expenses | 4,091 | 4,103
Interest expense | $ 917 | 910
Previously Reported [Member] | Insurance and Other [Member] |  |
Revenues: |  |
Sales and service revenues |  | 37,472
Interest, dividend and other investment income |  | 4,305
Costs and expenses: |  |
Cost of sales and services |  | 29,395
Selling, general and administrative expenses |  | 4,773
Interest expense |  | 316
Previously Reported [Member] | Railroad, Utilities and Energy [Member] |  |
Revenues: |  |
Utility and energy operating revenues |  | 17,690
Service revenues and other income |  | 1,069
Costs and expenses: |  |
Utility and energy cost of sales and other expenses |  | 16,268
Interest expense |  | 1,000
Reclassification [Member] | Insurance and Other [Member] |  |
Revenues: |  |
Sales and service revenues |  | 12,461
Interest, dividend and other investment income |  | 33
Costs and expenses: |  |
Cost of sales and services |  | 11,397
Selling, general and administrative expenses |  | 768
Interest expense |  | 90
Reclassification [Member] | Railroad, Utilities and Energy [Member] |  |
Revenues: |  |
Utility and energy operating revenues |  | (12,457)
Service revenues and other income |  | (37)
Costs and expenses: |  |
Utility and energy cost of sales and other expenses |  | (12,165)
Interest expense |  | $ (90)

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