Restructuring - Charges Activities by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	$ 186	$ 296	$ 504	$ 642
Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	61	205	143	358
Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	66	41	192	173
Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	59	50	169	111
Cost of sales
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	38	62	131	161
Cost of sales | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0	0	0
Cost of sales | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	33	41	89	139
Cost of sales | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	5	21	42	22
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	15	1	37	33
Selling, general and administrative | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0	0	0
Selling, general and administrative | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	15	1	37	33
Selling, general and administrative | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0	0	0
Research and development
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	19	1	67	4
Research and development | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0	0	0
Research and development | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	18	(1)	66	1
Research and development | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	1	2	1	3
Restructuring costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	114	232	269	444
Restructuring costs | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	61	205	143	358
Restructuring costs | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0	0	0
Restructuring costs | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	$ 53	$ 27	$ 126	$ 86