Business Segments - Capital Expenditures Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Capital expenditures	$ 770	$ 811	$ 881
Depreciation and amortization	795	778	781
Operating Segments
Segment Reporting Information [Line Items]
Capital expenditures	737	774	848
Depreciation and amortization	760	746	713
Operating Segments | Americas
Segment Reporting Information [Line Items]
Capital expenditures	369	406	525
Depreciation and amortization	430	414	398
Operating Segments | Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Capital expenditures	227	180	159
Depreciation and amortization	197	201	191
Operating Segments | Asia Pacific
Segment Reporting Information [Line Items]
Capital expenditures	141	188	164
Depreciation and amortization	133	131	124
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	33	37	33
Depreciation and amortization	$ 35	$ 32	$ 68