Stockholders' Equity - Other Comprehensive Income (Loss) Of Equity Investees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pretax Amount
Pensions and other postretirement benefits	$ 53	$ 80
Other comprehensive income, before tax	66	77	$ 40
Tax (Expense) Benefit
Other comprehensive income (loss)	(14)	(19)	(9)
Net-of-Tax Amount
Reclassification Adjustments	(1)	(22)
Other comprehensive income, net of tax	52	58	31
Pensions And Other Postretirement Liabilities
Pretax Amount
Pensions and other postretirement benefits	64	98	59
Reclassification adjustments for costs included in net income	(2)	(28)	(23)
Other comprehensive income, before tax	62	70	36
Tax (Expense) Benefit
Pensions and other postretirement benefits	(15)	(24)	(15)
Reclassification adjustments for costs included in net income	1	6	6
Other comprehensive income (loss)	(14)	(18)	(9)
Net-of-Tax Amount
Pensions and other postretirement benefits	49	74	44
Reclassification Adjustments	(1)	(22)	(17)
Other comprehensive income, net of tax	48	52	27
Other comprehensive income of equity investees
Pretax Amount
Other comprehensive income, before tax	4	7	4
Tax (Expense) Benefit
Other comprehensive income (loss)	0	(1)	0
Net-of-Tax Amount
Other comprehensive income, net of tax	$ 4	$ 6	$ 4