Restructuring - Charges Activities by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	$ 150	$ 159	$ 318	$ 346
Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	35	25	82	153
Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	73	98	126	132
Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	42	36	110	61
Cost of sales
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	25	65	93	99
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	31	64	56	98
Cost of sales | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	(6)	1	37	1
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	11	32	22	32
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	11	32	22	32
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	31	3	48	3
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	31	2	48	2
Research and development | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	1	0	1
Restructuring costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	83	59	155	212
Restructuring costs | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	35	25	82	153
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	$ 48	$ 34	$ 73	$ 59