Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Net sales	$ 1,774	$ 858
Cost of goods sold	1,250	577
Gross profit	524	281
Selling, general and administrative	416	174
Research and development	34	21
Operating income	74	86
Other (income) expense:
Equity income of unconsolidated subsidiaries		(2)
Gain on sale of business	(17)
Net interest expense	17	15
Income before income taxes and noncontrolling interest	74	73
Provision for income taxes	21	10
Net income before noncontrolling interest	53	63
Noncontrolling interest	1	1
Net income attributable to Pentair Ltd.	52	62
Comprehensive income (loss), net of tax
Net income before noncontrolling interest	53	63
Changes in cumulative translation adjustment	(76)	40
Changes in market value of derivative financial instruments	1	2
Total comprehensive income (loss)	(22)	105
Less: Comprehensive income attributable to noncontrolling interest	1	2
Comprehensive income (loss) attributable to Pentair Ltd.	$ (23)	$ 103
Earnings per common share attributable to Pentair Ltd.
Basic	$ 0.25	$ 0.63
Diluted	$ 0.25	$ 0.62
Weighted average common shares outstanding
Basic	204.8	98.6
Diluted	208.2	100.4
Cash dividends paid per common share	$ 0.23	$ 0.22