Restructuring - Activities by Program (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 513
Expenses	$ 199	$ 175	532	$ 559
(Payments) receipts, net			(294)
Non-cash activity			(184)
Restructuring reserve, ending balance	567		567
Separation Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			479
Expenses	95	65	246	197
(Payments) receipts, net			(191)
Non-cash activity			0
Restructuring reserve, ending balance	534		534
Accelerated Depreciation
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			0
Expenses	36	21	79	97
(Payments) receipts, net			0
Non-cash activity			(79)
Restructuring reserve, ending balance	0		0
Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			34
Expenses	68	$ 89	207	$ 265
(Payments) receipts, net			(103)
Non-cash activity			(105)
Restructuring reserve, ending balance	$ 33		$ 33