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Condensed Financial Information - Statements of Cash Flows (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities: |  |  |  |
Net earnings (loss) attributable to Berkshire shareholders |  | $ 88,995 | $ 96,223 | $ (22,759)
Adjustments to reconcile net earnings (loss) to operating cash flows: |  |  |  |
Income taxes payable |  | (8,163) | 14,865 | (12,872)
Other |  | (892) | (513) | (3,074)
Net cash flows from operating activities |  | 30,592 | 49,196 | 37,350
Cash flows from investing activities: |  |  |  |
Net cash flows from investing activities |  | (10,287) | (32,663) | (87,601)
Cash flows from financing activities: |  |  |  |
Acquisitions of treasury stock |  | (2,918) | (9,171) | (7,854)
Other |  | (5,622) | (4,147) | (1,979)
Net cash flows from financing activities |  | (10,360) | (14,405) | (1,662)
Increase (decrease) in cash and cash equivalents and restricted cash |  | 9,733 | 2,244 | (52,307)
Other cash flow information: |  |  |  |
Income taxes paid |  | 28,544 | 7,765 | 4,236
Class B common stock issued in exchange for noncontrolling interests |  | 1,045 |  |
Berkshire Hathaway Inc. (Parent) [Member] |  |  |  |
Cash flows from operating activities: |  |  |  |
Net earnings (loss) attributable to Berkshire shareholders |  | 88,995 | 96,223 | (22,759)
Adjustments to reconcile net earnings (loss) to operating cash flows: |  |  |  |
Undistributed (earnings) losses of consolidated subsidiaries |  | (14,314) | (85,550) | 39,579
Non-cash dividends from subsidiaries |  | (58,339) | (1,811) | (7,220)
Income taxes payable |  | 294 | (44) | 661
Other | [1] | (2,666) | (1,207) | (1,799)
Net cash flows from operating activities |  | 13,970 | 7,611 | 8,462
Cash flows from investing activities: |  |  |  |
Investments in and advances to consolidated subsidiaries, net |  | (1,332) | 2,649 | (11,852)
Purchases of U.S. Treasury Bills |  | (52,864) | (27,278) | (44,187)
Sales and maturities of U.S. Treasury Bills and other |  | 40,244 | 31,234 | 38,043
Net cash flows from investing activities |  | (13,952) | 6,605 | (17,996)
Cash flows from financing activities: |  |  |  |
Proceeds from borrowings |  | 5,525 | 2,054 | 1,970
Repayments of borrowings |  | (1,854) | (4,310) | (602)
Acquisitions of treasury stock |  | (2,918) | (9,171) | (7,854)
Net cash flows from financing activities |  | 753 | (11,427) | (6,486)
Increase (decrease) in cash and cash equivalents and restricted cash |  | 771 | 2,789 | (16,020)
Cash and cash equivalents at the beginning of the year |  | 5,566 | 2,777 | 18,797
Cash and cash equivalents at the end of the year |  | 6,337 | 5,566 | 2,777
Other cash flow information: |  |  |  |
Income taxes paid |  | 26,455 | 5,630 | 2,259
Interest paid |  | 318 | $ 297 | $ 332
Class B common stock issued in exchange for noncontrolling interests |  | $ 1,045 |  |
[1] | I ncludes discount accretion on investments and foreign currency exchange (gains) losses.

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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 15 -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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