Income Taxes - Significant Components of Deferred Tax Assets Net of Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
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