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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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