Business Optimization Charges - Components of Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Charges	$ 17	$ 63	$ 94	$ 96
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Charges	9	16	33	21
Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Charges	2	38	28	56
Research and Development Expenses
Restructuring Cost and Reserve [Line Items]
Charges	6	9	33	19
Employee termination costs
Restructuring Cost and Reserve [Line Items]
Charges	5	58	62	86
Employee termination costs | Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Charges	1	16	7	20
Employee termination costs | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Charges	2	33	27	47
Employee termination costs | Research and Development Expenses
Restructuring Cost and Reserve [Line Items]
Charges	2	9	28	19
Contract termination and other costs
Restructuring Cost and Reserve [Line Items]
Charges	1		9
Contract termination and other costs | Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Charges	1		9
Contract termination and other costs | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Charges	0		0
Contract termination and other costs | Research and Development Expenses
Restructuring Cost and Reserve [Line Items]
Charges	0		0
Asset impairments
Restructuring Cost and Reserve [Line Items]
Charges	11	1	23	4
Asset impairments | Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Charges	7	0	17	1
Asset impairments | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Charges	0	1	1	3
Asset impairments | Research and Development Expenses
Restructuring Cost and Reserve [Line Items]
Charges	$ 4	0	$ 5	0
Contract termination costs
Restructuring Cost and Reserve [Line Items]
Charges		4		6
Contract termination costs | Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Charges		0		0
Contract termination costs | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Charges		4		6
Contract termination costs | Research and Development Expenses
Restructuring Cost and Reserve [Line Items]
Charges		$ 0		$ 0