Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate on Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
Provision for income taxes at U.S. federal statutory rate	$ 264
State and local income tax, net of federal (national) income tax effect	(6)
Tax benefit on U.S. railroad credits	(63)
Other tax credits	(27)
Amended 2017 tax return - transition tax	(24)
Other	13
Change in unrecognized tax benefits	(17)
Income tax expense	$ 182	$ 476	$ 828
Percent
Provision for income taxes at U.S. federal statutory rate	21.00%	21.00%	21.00%
State and local income tax, net of federal (national) income tax effect	(0.50%)	0.20%	0.90%
Other		(0.80%)	(1.50%)
Impairment of Investments		4.30%	0.50%
Foreign Tax Effects		2.20%	(0.30%)
Tax benefit on U.S. railroad credits	(5.00%)	(2.50%)	(1.50%)
Other tax credits	(2.10%)
Amended 2017 tax return - transition tax	(2.00%)
Other	1.10%
Change in unrecognized tax benefits	(1.40%)	3.20%	0.10%
Foreign currency effects/remeasurement		(4.80%)	0.50%
Withholding Tax		1.80%	0.10%
Tax benefit on U.S. biodiesel credits		(2.90%)	(1.70%)
Second-generation biofuel credit		(1.20%)	0.00%
U.S. tax on foreign earnings		0.60%	1.20%
Total tax expense and effective tax rate	14.50%	21.10%	19.30%
Singapore
Amount
Singapore - Non-taxable Equity Earning	$ (65)
Other	$ (21)
Percent
Singapore - Non-taxable Equity Earning	(5.20%)
Other	(1.70%)
Japan
Amount
Other	$ (15)
Japan - Non-deductible Impairment	$ 40
Percent
Other	(1.20%)
Impairment of Investments	3.20%
Brazil
Amount
Other	$ (2)
Brazil - Valuation Allowance	$ 53
Percent
Other	(0.10%)
Brazil - Valuation Allowance	4.20%
Switzerland
Amount
Other	$ 22
Foreign Tax Effects:	$ (35)
Percent
Other	1.80%
Foreign Tax Effects	(2.80%)
Other Foreign Tax Effects
Amount
Foreign Tax Effects:	$ 68
Percent
Foreign Tax Effects	5.40%
United States
Amount
Other	$ (3)
Percent
Other	(0.20%)