Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2025	Jun. 30, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
U.S. federal statutory tax			$ 553	$ (2,564)	$ (421)
State income tax provision, net of effects on U.S. federal tax			73	(223)	(75)
Tax on non-U.S. activities				113	35
Other provision adjustments				47	49
Federal audit settlement				(490)
Changes in valuation allowances				3,145	1,150
Tax Credits - Research and development credits			(559)	(409)	(472)
Non-prosecution agreement liability			93
Impact of subsidiary shares purchased from noncontrolling interests					(29)
Changes in prior year worldwide unrecognized tax benefits			69
Total income tax expense/(benefit)			$ 397	$ (381)	$ 237
Rate
U.S. federal statutory tax			21.00%	21.00%	21.00%
State income tax provision, net of effects on U.S. federal tax			2.80%	1.80%	3.70%
Tax on non-U.S. activities				(0.90%)	(1.80%)
Other provision adjustments				(0.30%)	(2.50%)
Federal audit settlement				4.00%
Changes in valuation allowances				(25.80%)	(57.30%)
Tax Credits - Research and development credits			(21.20%)	3.30%	23.60%
Non-prosecution agreement liability			3.50%
Impact of subsidiary shares purchased from noncontrolling interests					1.50%
Changes in prior year worldwide unrecognized tax benefits			2.60%
Income tax (benefit)/expense			15.10%	3.10%	(11.80%)
Deferred tax assets, valuation allowance expense		$ 155	$ 120
Effective income tax rate reconciliation, tax contingency, amount		$ 490
Digital Aviation Solutions
Amount
Effect of cross-border tax laws - Global Intangible Low-Taxed Income - Digital Aviation Solutions Divestiture			1,242
Digital Aviation Solutions Divestiture			$ (61)
Rate
Effect of cross-border tax laws - Global Intangible Low-Taxed Income - Digital Aviation Solutions Divestiture			47.10%
Digital Aviation Solutions Divestiture			(2.30%)
Germany | Digital Aviation Solutions
Amount
Digital Aviation Solutions Divestiture			$ (751)
Rate
Digital Aviation Solutions Divestiture			(28.50%)
Effective income tax rate reconciliation, divestiture differential, amount			$ (203)
Effective income tax rate reconciliation, divestiture differential, percent			(7.70%)
Effective income tax rate reconciliation, divestiture participation exemption, amount			$ (548)
Effective income tax rate reconciliation, divestiture participation exemption, percent			(20.80%)
SWEDEN | Digital Aviation Solutions
Amount
Digital Aviation Solutions Divestiture			$ (393)
Rate
Digital Aviation Solutions Divestiture			(14.90%)
Other foreign
Amount
Other provision adjustments			$ 121
Rate
Other provision adjustments			4.60%
Deferred tax assets, valuation allowance expense			$ 9
Other foreign | Digital Aviation Solutions
Amount
Total income tax expense/(benefit)	$ 59
United States
Amount
Other provision adjustments			60
Changes in valuation allowances			$ (50)
Rate
Other provision adjustments			2.30%
Changes in valuation allowances			(1.90%)
Domestic Tax Jurisdiction
Rate
Deferred tax assets, valuation allowance expense			$ 50
State and Local Jurisdiction
Rate
Deferred tax assets, valuation allowance expense			$ 161