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Income Taxes - Significant Components of Deferred Tax Assets Net of Deferred Tax Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Valuation Allowance [Line Items] |  |
Inventory and long-term contract methods of income recognition | $ (4,765) | $ (5,115)
Research expenditures | 3,936 | 2,873
Fixed assets, intangibles and goodwill | (1,526) | (1,566)
Other employee benefits | 1,049 | 1,162
Pension benefits | 1,045 | 1,178
Accrued expenses and reserves | 1,029 | 956
Other postretirement benefit obligations | 587 | 590
Other | 473 | 614
Gross deferred tax assets/(liabilities) before valuation allowance | 7,900 | 4,380
Valuation allowance | (7,837) | (4,550)
Net deferred tax assets after valuation allowance | 63 |
Net deferred tax liabilities after valuation allowance |  | (170)
Federal Tax Authority |  |
Valuation Allowance [Line Items] |  |
Federal and state net operating loss, credit, interest and other carryovers | 4,719 | 2,551
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2044 | 1,848 |
Deferred tax asset for net operating loss and credit carryovers indefinitely | 2,871 |
State Tax Authority |  |
Valuation Allowance [Line Items] |  |
Federal and state net operating loss, credit, interest and other carryovers | 1,353 | $ 1,137
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2044 | 686 |
Deferred tax asset for net operating loss and credit carryovers indefinitely | $ 667 |

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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary difference from in-process research and development cost acquired in business combination or from joint venture formation or both. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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