Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reclassifications out of accumulated other comprehensive income loss by component
Interest expense	$ 279	$ 352
Other (expense) income, net	40	(70)
Total before tax	(680)	(801)
Income tax expense	169	202
Net income	(511)	(599)
Decrease (Increase) in Net Income | Interest rate swaps
Reclassifications out of accumulated other comprehensive income loss by component
Interest expense		22
Income tax expense		(5)
Net income		17
Decrease (Increase) in Net Income | Net actuarial loss
Reclassifications out of accumulated other comprehensive income loss by component
Other (expense) income, net	20	37
Decrease (Increase) in Net Income | Prior service cost
Reclassifications out of accumulated other comprehensive income loss by component
Other (expense) income, net	(4)	(1)
Decrease (Increase) in Net Income | Defined benefit plan
Reclassifications out of accumulated other comprehensive income loss by component
Total before tax	16	36
Income tax expense	(4)	(9)
Net income	$ 12	$ 27