Asset Impairment and Exit Costs (Asset Impairment and Exit Costs by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	$ 216	$ 149	$ 422
Employee Severance
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs		141	303
Contract Termination
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	57	0
Asset Impairment
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	0	8	119
European Union | Operating Segments
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs			342
European Union | Operating Segments | Employee Severance
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	68	53	251
European Union | Operating Segments | Asset Impairment
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	0	4	91
Eastern Europe | Operating Segments | Employee Severance
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	14	14	0
Eastern Europe | Operating Segments | Asset Impairment
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	0	1	0
Middle East & Africa | Operating Segments | Employee Severance
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	17	18	0
Middle East & Africa | Operating Segments | Asset Impairment
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	0	1	0
South & Southeast Asia | Operating Segments | Employee Severance
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	21	22	3
South & Southeast Asia | Operating Segments | Asset Impairment
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	0	1	17
East Asia & Australia | Operating Segments | Employee Severance
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	31	25	0
East Asia & Australia | Operating Segments | Contract Termination
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	57	0
East Asia & Australia | Operating Segments | Asset Impairment
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	0	1	0
Americas | Operating Segments | Employee Severance
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	8	9	49
Americas | Operating Segments | Asset Impairment
Restructuring Cost and Reserve [Line Items]
Total asset impairment and exit costs	$ 0	$ 0	$ 11