Business Segments - Capital Expenditures Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Capital expenditures	$ 647	$ 770	$ 811
Depreciation and amortization	859	795	778
Operating Segments
Segment Reporting Information [Line Items]
Capital expenditures	628	737	774
Depreciation and amortization	824	760	746
Operating Segments | Americas
Segment Reporting Information [Line Items]
Capital expenditures	302	369	406
Depreciation and amortization	490	430	414
Operating Segments | Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Capital expenditures	235	227	180
Depreciation and amortization	201	197	201
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Capital expenditures	91	141	188
Depreciation and amortization	133	133	131
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	19	33	37
Depreciation and amortization	$ 35	$ 35	$ 32