Income Taxes - Significant Components of Deferred Tax Assets Net of Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Valuation Allowance [Line Items]
Inventory and long-term contract methods of income recognition	$ (5,584)	$ (4,765)
Fixed assets, intangibles and goodwill	(1,847)	(1,526)
Accrued expenses and reserves	1,512	1,029
Other employee benefits	1,313	1,049
Pension benefits	880	1,045
International net operating loss, credit and capital loss carryovers	598	70
Other postretirement benefit obligations	562	587
Research Expenditures	278	3,936
Other	329	403
Gross deferred tax assets before valuation allowance	9,645	7,900
Valuation allowance	(9,754)	(7,837)
Net deferred tax liabilities after valuation allowance	(109)
Net deferred tax assets after valuation allowance		63
Federal Tax Authority
Valuation Allowance [Line Items]
Federal and state net operating loss, credit, interest and other carryovers	9,569	4,719
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2045	2,332
Deferred tax asset for net operating loss and credit carryovers indefinitely	7,237
State Tax Authority
Valuation Allowance [Line Items]
Federal and state net operating loss, credit, interest and other carryovers	2,035	$ 1,353
Deferred tax asset for net operating loss and credit carryovers each year through December 31, 2045	1,035
Deferred tax asset for net operating loss and credit carryovers indefinitely	$ 1,000