Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment Gross	$ 4,977	$ 5,337
Less: Accumulated Depreciation	(3,050)	(2,983)
Property, plant and equipment, net	1,927	2,354
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment Gross	175	231
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment Gross	$ 1,343	1,309
Estimated Useful Lives	5-35 Years
Operating Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment Gross	$ 2,660	2,946
Estimated Useful Lives	2-20 Years
Rental Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment Gross	$ 799	$ 851
Estimated Useful Lives	2-15 Years