Pension and Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024	Apr. 01, 2024
Benefit Plan Information
Discontinued operation, pension plan benefit obligation			$ 2,700
Discontinued operation, postretirement plan benefit obligation			$ 2,400
Settlements, curtailments, special termination benefits and other		$ 800
U.S. Pension Plans
Benefit Plan Information
Company contributions	$ 55
U.S. Pension Plans | United States
Benefit Plan Information
Pension payment obligations transferred		$ 2,500
Postretirement benefits
Benefit Plan Information
Company contributions	$ 6