Commitments and Contingencies Environmental (Details) - Environmental Issue $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) site	Mar. 31, 2025 USD ($)
Loss Contingencies [Line Items]
Number of alleged environmental contamination sites | site	180
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 213	$ 224
Accruals / changes in estimates	2	1
Payments	(5)	(3)
Ending balance	210	222
Current portion of ending balance	35	$ 35
Minimum
Loss Contingencies [Line Items]
Possible future costs to settle claims	185
Maximum
Loss Contingencies [Line Items]
Possible future costs to settle claims	$ 240