Reorganization of Businesses - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($) employee	Dec. 31, 2019 USD ($) employee	Dec. 31, 2018 USD ($) employee	Dec. 31, 2017 USD ($) employee	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Additional charges			$ 138	$ 51
Reorganization of business charges		$ 57	120	42
Net adjustment of accruals		$ (12)	(18)	(9)
Restructuring reserve	$ 105		105	50	$ 101
Cash payments for exit costs			65	93
Number of employees expected to be separated (in number of employees) | employee		100
Costs of sales
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges		$ 17	59	9
Other charges
Restructuring Cost and Reserve [Line Items]
Reorganization of business charges		40	61	33
Facility Closing
Restructuring Cost and Reserve [Line Items]
Additional charges	$ 44
Number of employees impacted | employee	165
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Additional charges			122	43
Reorganization of business charges		$ 64	122	43
Net adjustment of accruals			(18)	(9)
Restructuring reserve	$ 84		$ 84	$ 41	94
Restructuring charges in the period for total employee severance (in number of employees) | employee		700	1,200	400
Restructuring charges in the period for direct employees' severance (in number of employees) | employee		200	500	100
Restructuring charges in the period for indirect employees' severance (in number of employees) | employee		500	700	300
Cash payments for exit costs			$ 61	$ 87
Exit costs
Restructuring Cost and Reserve [Line Items]
Additional charges			16	8
Reorganization of business charges		$ 5	16	8
Net adjustment of accruals			0	0
Restructuring reserve	$ 21		21	9	$ 7
Cash payments for exit costs			$ 4	$ 6