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Capital Stock, Accumulated Other Comprehensive Loss and Equity - Additional Information (Detail) | 3 Months Ended | 12 Months Ended | 96 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 USD ($) vote $ / shares shares | Sep. 29, 2018 $ / shares | Jun. 30, 2018 $ / shares | Mar. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares shares | Sep. 30, 2017 $ / shares | Jul. 01, 2017 $ / shares | Apr. 01, 2017 $ / shares | Dec. 31, 2016 $ / shares | Oct. 01, 2016 $ / shares | Jul. 02, 2016 $ / shares | Apr. 02, 2016 $ / shares | Dec. 31, 2018 USD ($) vote $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2018 USD ($) vote $ / shares shares
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares | 300,000,000 |  |  |  | 300,000,000 |  |  |  |  |  |  |  | 300,000,000 | 300,000,000 |  | 300,000,000
Common stock holders voting right, vote per outstanding share | vote | 1 |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 1
Common stock, aggregate authorized repurchase amount | $ 5,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000,000.0 |  |  | $ 5,000,000,000.0
Cash paid for Repurchases |  |  |  |  |  |  |  |  |  |  |  |  | $ 704,900,000 | $ 450,500,000 | $ 658,800,000 | $ 4,200,000,000
Repurchases of shares of common stock, average price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 163.69 | $ 150.77 | $ 113.26 | $ 87.20
Remaining repurchase authorization | $ 799,800,000 |  |  |  |  |  |  |  |  |  |  |  | $ 799,800,000 |  |  | $ 799,800,000
Retirement of shares held in treasury (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 | 8,000,000 |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Cash dividends declared (in dollars per share) | $ / shares | $ 0.7 | $ 0.7 | $ 0.7 | $ 0.7 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.5 | $ 0.3 | $ 0.3 | $ 0.3 | $ 0.3 |  |  |  |
Dividends declared to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 185,800,000 | 140,300,000 | $ 89,100,000 |
Dividends paid to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 186,300,000 | 137,700,000 | 88,800,000 |
Pretax income (loss) related to intercompany transactions for which settlement is not planned or anticipated in the foreseeable future |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,200,000) | 900,000 | (200,000) |
Purchase of remaining noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,600,000 |
Percentage ownership of affiliate after transaction |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 | 100,000 |  |
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  | 155,900,000 | 155,900,000 |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  | 1,014,200,000 | 735,500,000 |  |
Dividends declared to Lear Corporation stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 185,800,000 | 140,300,000 | $ 89,100,000 |
Treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (reduction) for retirement of shares held in treasury |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,170,200,000) | $ (891,500,000) |  |

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