Restructuring charges and impairment charges - Cost Estimates By Major Type of Expense (Details) - 2019 Footprint realignment plan $ in Millions	May 01, 2018 USD ($)
Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	$ 56
Minimum | Termination benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	19
Minimum | Other exit costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	1
Minimum | Special Termination Benefit And Other Restructuring
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	20
Minimum | Accelerated Depreciation And Other Costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	36
Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	70
Maximum | Termination benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	23
Maximum | Other exit costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	2
Maximum | Special Termination Benefit And Other Restructuring
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	25
Maximum | Accelerated Depreciation And Other Costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	$ 45