Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassifications out of accumulated other comprehensive income loss by component
Other income (expense), net	$ (194)	$ (16)	$ (267)	$ 24
Total before tax	41	8,690	(61)	8,010
Income tax expense	8	46	53	215
Net income (loss)	49	8,736	(8)	8,225
Decrease (Increase) in Net Income | Net actuarial loss
Reclassifications out of accumulated other comprehensive income loss by component
Other income (expense), net	21	21	45	41
Decrease (Increase) in Net Income | Prior service credit
Reclassifications out of accumulated other comprehensive income loss by component
Other income (expense), net	(3)	(3)	(7)	(7)
Decrease (Increase) in Net Income | Defined Benefit Plan
Reclassifications out of accumulated other comprehensive income loss by component
Total before tax	18	18	38	34
Income tax expense	(4)	(4)	(9)	(8)
Net income (loss)	$ 14	$ 14	$ 29	$ 26