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Income Taxes - Significant Components of Deferred Tax Assets Net of Deferred Tax Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Valuation Allowance [Line Items] |  |
Inventory and long-term contract methods of income recognition | $ (5,115) | $ (4,369)
Research expenditures | 2,873 | 1,464
Fixed assets, intangibles and goodwill | (1,566) | (1,641)
Pension benefits | 1,178 | 1,146
Other employee benefits | 1,162 | 1,095
Accrued expenses and reserves | 956 | 933
Other postretirement benefit obligations | 590 | 660
737 MAX customer concessions and other considerations | 310 | 425
Other | 304 | 179
Gross deferred tax assets/(liabilities) before valuation allowance | 4,380 | 2,995
Valuation allowance | (4,550) | (3,162)
Net deferred tax assets/(liabilities) after valuation allowance | (170) | (167)
Federal Tax Authority |  |
Valuation Allowance [Line Items] |  |
Federal and state net operating loss, credit, interest and other carryovers | 2,551 | 2,082
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2043 | 1,224 |
Deferred tax asset for net operating loss and credit carryovers indefinitely | 1,327 |
State Tax Authority |  |
Valuation Allowance [Line Items] |  |
Federal and state net operating loss, credit, interest and other carryovers | 1,137 | $ 1,021
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2043 | 575 |
Deferred tax asset for net operating loss and credit carryovers indefinitely | $ 562 |

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