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Eaton Shareholders' Equity Eaton Shareholders' Equity - Net Income per Ordinary Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]      
Net income attributable to Eaton ordinary shareholders $ 1,979 $ 1,793 $ 1,861
Weighted-average number of ordinary shares outstanding - diluted 467.1 476.8 476.7
Less dilutive effect of equity-based compensation 1.6 2.7 3.2
Weighted-average number of ordinary shares outstanding - basic 465.5 474.1 473.5
Net income per ordinary share - diluted $ 4.23 $ 3.76 $ 3.90
Net income per ordinary share - basic $ 4.25 $ 3.78 $ 3.93