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Shareholders' equity and share-based payments - SunPower Plans (Details)
shares in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
plan
installment
EquityInstruments
shares
Dec. 31, 2016
USD ($)
EquityInstruments
shares
Dec. 31, 2015
USD ($)
EquityInstruments
shares
SunPower Plans      
Share-based payments      
Number of stock incentive plans | plan 3    
Number of shares withheld to satisfy employees' tax obligations | shares 0.6 1.0 1.4
2015 Plan (SunPower)      
Share-based payments      
Annual automatic increase in awards, as percent of the outstanding shares of the preceding year 3.00%    
Maximum annual increase of awards 6,000,000    
Shares available for grant | shares 8.8    
Stock options (SunPower)      
Share-based payments      
Expiry period 10 years    
Number of share options outstanding and exercisable in share-based payment arrangement 0    
Number of share options exercised in share-based payment arrangement 322    
Intrinsic value of options exercised | $ $ 1,700 $ 0 $ 1,000,000
Granted (in shares) 0 0 0
Stock options - 2005 Plan (SunPower)      
Share-based payments      
Vesting period 5 years    
Cliff vesting period 1 year    
Stock options - PowerLight Plan (SunPower)      
Share-based payments      
Vesting period 5 years    
Restricted stock grants and restricted stock units - 2005 and 2015 Plans (SunPower)      
Share-based payments      
Vesting period 3 years    
Number of equal vesting installments | installment 3