Asset Impairment, Exit and Implementation Costs (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended			39 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs		$ 216,000,000	$ 453,000,000	$ 78,000,000
Payments for restructuring		147,000,000	32,000,000
Refocus of Innovative Product Efforts [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs		9,000,000	272,000,000
Refocus of Innovative Product Efforts [Member] | Asset Impairment and Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs			209,000,000
Refocus of Innovative Product Efforts [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs			63,000,000
Cost Reduction Program [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs		133,000,000	121,000,000
Restructuring and related cost, cost incurred to date		254,000,000			$ 254,000,000
Payments for restructuring	$ 0	136,000,000
Cost Reduction Program [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date		52,000,000			52,000,000
Cost Reduction Program [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date		202,000,000			202,000,000
Facility Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment, exit costs and implementation costs			6,000,000	$ 78,000,000
Restructuring and related cost, cost incurred to date	155,000,000		155,000,000
Payments for restructuring		$ 3,000,000			$ 100,000,000
Facility Consolidation [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	60,000,000		60,000,000
Facility Consolidation [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	40,000,000		40,000,000
Facility Consolidation [Member] | Accelerated Depreciation And Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	$ 55,000,000		$ 55,000,000