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EATON SHAREHOLDERS' EQUITY - Narrative (Details) |  | 2 Months Ended | 12 Months Ended |  |  |
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Feb. 23, 2022 USD ($) $ / shares | Feb. 23, 2022 USD ($) | Dec. 31, 2021 USD ($) employee $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2021 € / shares | Dec. 31, 2021 USD ($) holder $ / shares shares | Dec. 31, 2020 € / shares | Dec. 31, 2020 USD ($) $ / shares shares | Feb. 27, 2019 USD ($)
Shareholders Equity Textuals Abstract |  |  |  |  |  |  |  |  |  |
Ordinary shares authorized (shares) |  |  |  |  |  |  | 750,000,000 |  |  |
Ordinary share par value (USD per share) | $ / shares |  |  |  |  |  |  | $ 0.01 |  |  |
Ordinary shares outstanding (shares) |  |  |  |  |  |  | 398,800,000 |  | 398,100,000 |
Ordinary shares issued (shares) |  |  |  |  |  |  | 398,800,000 |  | 398,100,000 |
Deferred ordinary shares authorized (shares) |  |  |  |  |  |  | 40,000 |  | 40,000 |
Deferred ordinary shares par value (USD per share) | € / shares |  |  |  |  |  | € 1.00 |  | € 1.00 |  |
Deferred ordinary shares, shares issued and outstanding (shares) |  |  |  |  |  |  | 40,000 |  | 40,000 |
Number of holders of record of Eaton ordinary shares | holder |  |  |  |  |  |  | 10,447 |  |  |
Number of current and former employees who were shareholders through various Eaton plans | employee |  |  | 14,835 |  |  |  |  |  |  |
Disclosure of Repurchase Agreements [Abstract] |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized amount | $ |  |  |  |  |  |  |  |  |  | $ 5,000,000,000
Ordinary shares purchased (shares) |  |  | 900,000 | 17,100,000 |  |  |  |  |  |
Stock repurchased (shares) | $ |  |  | $ 122,000,000 | $ 1,608,000,000 |  |  |  |  |  |
Employee Trust [Abstract] |  |  |  |  |  |  |  |  |  |
Deferred compensation plan trust of shares and marketable secutities | $ |  |  |  |  |  |  | $ 4,000,000 |  | $ 3,000,000 |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |
Quarterly dividends declared per share (USD per share) | $ / shares |  |  | $ 3.04 | $ 2.92 | $ 2.84 |  |  |  |  |
Antidilutive securities excluded from computation of net income per ordinary share (shares) |  |  |  | 600,000 | 800,000 |  |  |  |  |
Preferred A Stock |  |  |  |  |  |  |  |  |  |
Shareholders Equity Textuals Abstract |  |  |  |  |  |  |  |  |  |
Preferred stock issued (shares) |  |  |  |  |  |  | 10,000 |  | 10,000 |
Preferred stock authorized (shares) |  |  |  |  |  |  | 10,000 |  | 10,000 |
Preferred stock outstanding (shares) |  |  |  |  |  |  | 10,000 |  | 10,000 |
Preferred stock, par value (USD per share) | $ / shares |  |  |  |  |  |  | $ 1.00 |  | $ 1.00 |
Serial Preferred |  |  |  |  |  |  |  |  |  |
Shareholders Equity Textuals Abstract |  |  |  |  |  |  |  |  |  |
Preferred stock authorized (shares) |  |  |  |  |  |  | 10,000,000 |  | 10,000,000 |
Preferred stock outstanding (shares) |  |  |  |  |  |  | 0 |  | 0 |
Preferred stock, par value (USD per share) | $ / shares |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Disclosure of Repurchase Agreements [Abstract] |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized amount | $ | $ 5,000,000,000 | $ 5,000,000,000 |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |
Quarterly dividends declared per share (USD per share) | $ / shares | $ 0.81 |  |  |  |  |  |  |  |  |
Dividend increase percentage over dividend paid in prior quarter (as a percent) |  | 7.00% |  |  |  |  |  |  |  |

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