Description of Business and Significant Accounting Policies - Capitalized Software and Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation		$ 86	$ 90	$ 91
Capitalized Software [Roll Forward]
Beginning balance	$ 345	345	311	257
Capitalization		166	154	150
Amortization		(145)	(118)	(80)
Impairment		0	(2)	(16)
Ending balance		$ 366	$ 345	$ 311
Machinery and other equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Machinery and other equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Building [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	25 years
Building [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	45 years
Software Development Costs, Internal Use [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Capitalized computer software, useful life	4 years
Software Development Costs, Internal Use [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Capitalized computer software, useful life	7 years
Software and Software Development Costs [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Capitalized computer software, useful life	3 years
Software and Software Development Costs [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Capitalized computer software, useful life	5 years