Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Reclassifications out of accumulated other comprehensive income loss by component
Other income, net	$ (30)	$ (73)
Total before tax	245	(102)
Income tax (benefit) expense	(44)	45
Net income (loss)	201	(57)
Decrease (Increase) in Net Income | Defined Benefit Plan
Reclassifications out of accumulated other comprehensive income loss by component
Total before tax	27	20
Income tax (benefit) expense	(7)	(5)
Net income (loss)	20	15
Decrease (Increase) in Net Income | Net actuarial loss
Reclassifications out of accumulated other comprehensive income loss by component
Other income, net	29	24
Decrease (Increase) in Net Income | Prior service credit
Reclassifications out of accumulated other comprehensive income loss by component
Other income, net	$ (2)	$ (4)