Accumulated Other Comprehensive Loss - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Reclassifications out of accumulated other comprehensive income loss by component
Interest expense	$ 295	$ 363	$ 868	$ 1,052
Other expense, net	13	93	37	145
Total before tax	85	(937)	8,095	(2,191)
Income tax (benefit) expense	(7)	359	208	670
Gain on sale of business	22	0	112	0
Net of tax	78	(578)	8,303	(1,521)
Decrease (Increase) in Net Income | Interest rate swap
Reclassifications out of accumulated other comprehensive income loss by component
Interest expense		0		22
Income tax (benefit) expense		0		(5)
Net of tax		0		17
Decrease (Increase) in Net Income | Net actuarial loss
Reclassifications out of accumulated other comprehensive income loss by component
Other expense, net	22	32	63	99
Decrease (Increase) in Net Income | Prior service cost
Reclassifications out of accumulated other comprehensive income loss by component
Other expense, net	(4)	(2)	(11)	(3)
Decrease (Increase) in Net Income | Defined benefit plan
Reclassifications out of accumulated other comprehensive income loss by component
Total before tax	18	30	52	96
Income tax (benefit) expense	(5)	(7)	(13)	(24)
Net of tax	$ 13	23	$ 39	72
Decrease (Increase) in Net Income | Foreign currency translation
Reclassifications out of accumulated other comprehensive income loss by component
Income tax (benefit) expense		0		0
Gain on sale of business		112		112
Net of tax		$ 112		$ 112