Subsequent event (Details) - 2016 Manufacturing Footprint Realignment Plan $ in Millions	Dec. 31, 2015 USD ($)
Maximum
Subsequent Event [Line Items]
Expected restructuring charges	$ 44
Restructuring costs expected cash payment	31
Minimum
Subsequent Event [Line Items]
Expected restructuring charges	34
Restructuring costs expected cash payment	27
Termination Benefits | Maximum
Subsequent Event [Line Items]
Expected restructuring charges	18
Termination Benefits | Minimum
Subsequent Event [Line Items]
Expected restructuring charges	14
Facility Closure Costs | Maximum
Subsequent Event [Line Items]
Expected restructuring charges	3
Facility Closure Costs | Minimum
Subsequent Event [Line Items]
Expected restructuring charges	2
Accelerated Depreciation Charges | Maximum
Subsequent Event [Line Items]
Expected restructuring charges	13
Accelerated Depreciation Charges | Minimum
Subsequent Event [Line Items]
Expected restructuring charges	10
Other | Maximum
Subsequent Event [Line Items]
Expected restructuring charges	10
Other | Minimum
Subsequent Event [Line Items]
Expected restructuring charges	$ 8