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Comprehensive Income (Loss) and Equity - Narrative (Details) $ / shares in Units, ¥ in Millions | 2 Months Ended | 3 Months Ended | 6 Months Ended | 114 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2020 $ / shares | Jul. 04, 2020 USD ($) $ / shares | Apr. 04, 2020 $ / shares | Jun. 29, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Jul. 04, 2020 USD ($) $ / shares | Jun. 29, 2019 USD ($) $ / shares | Jul. 04, 2020 USD ($) $ / shares | Apr. 02, 2011 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments related to intercompany transactions (gains) losses |  | $ (500,000) |  | $ (100,000) |  |  | $ 1,100,000 |  |  |
Aggregate purchases authorized under common stock share repurchase program |  |  |  |  |  |  |  |  |  | $ 6,100,000,000
Aggregate repurchases |  |  |  | $ 161,600,000 |  |  | $ 70,000,000.0 | $ 279,500,000 | $ 4,700,000,000 |
Average price (in dollars per share) | $ / shares |  |  |  | $ 136.63 |  |  | $ 109.22 | $ 140.65 | $ 90.07 |
Cash dividends declared per share (in dollars per share) | $ / shares | $ 0.77 | $ 0 | $ 0.75 | $ 0.75 |  |  |  | $ 1.50 |  |
Shanghai Lear STEC Automotive Parts Co., Ltd |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  | 45.00% |  |  |  |  | 45.00% |  | 45.00% |
Forecast |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of undistributed retained earnings to be paid at closing |  |  |  |  | 50.00% | 50.00% |  |  |  |
Forecast | Shanghai Lear STEC Automotive Parts Co., Ltd |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Payments for repurchase of redeemable noncontrolling interest |  |  |  |  | $ 88,600,000 | ¥ 626.0 |  |  |  |
Forecast | Shanghai Lear STEC Automotive Parts Co., Ltd | Retained Earnings |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Payments for repurchase of redeemable noncontrolling interest |  |  |  |  | $ 24,800,000 | ¥ 175.5 |  |  |  |

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