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Basic and Diluted Earnings Per Share (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Computation Of Earnings Per Share Line Items    
Net income attributable to Pentair Ltd. $ 52 $ 62
Weighted average common shares outstanding    
Basic 204.8 98.6
Dilutive impact of stock options and restricted stock units 3.4 [1] 1.8 [1]
Diluted 208.2 100.4
Earnings per common share attributable to Pentair Ltd.    
Basic earnings per common share $ 0.25 $ 0.63
Diluted earnings per common share $ 0.25 $ 0.62
Anti-dilutive stock options and restricted stock units 1.0 [2] 2.5 [2]
[1] The incremental share impact from stock options and restricted stock units was computed using the treasury stock method.
[2] Stock options and restricted stock units that were not dilutive were excluded from our calculation of diluted weighted average shares.