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Capital Stock, Accumulated Other Comprehensive Loss and Equity - Narrative (Details)
3 Months Ended 12 Months Ended 120 Months Ended
Dec. 31, 2020
USD ($)
vote
$ / shares
shares
Apr. 04, 2020
$ / shares
Dec. 31, 2020
USD ($)
vote
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
vote
$ / shares
shares
Equity, Class of Treasury Stock [Line Items]            
Common stock, shares authorized (in shares) | shares 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 $ 6,100,000,000   $ 6,100,000,000     $ 6,100,000,000
Cash paid for Repurchases     $ 70,000,000.0 $ 384,700,000 $ 704,900,000 $ 4,700,000,000
Repurchases of shares of common stock, average price (in dollars per share) | $ / shares     $ 109.22 $ 134.95 $ 163.69 $ 90.07
Remaining repurchase authorization $ 1,400,000,000   $ 1,400,000,000     $ 1,400,000,000
Retirement of shares held in treasury (in shares) | shares         8,000,000  
Increase (reduction) for retirement of shares held in treasury         $ 0  
Cash dividends declared (in dollars per share) | $ / shares $ 0.25 $ 0.77   $ 0.75 $ 0.70  
Pretax income (loss) related to intercompany transactions for which settlement is not planned or anticipated in the foreseeable future     (600,000) $ (500,000) $ (1,200,000)  
Derivatives net investment hedge foreign currency translation $ (18,300,000)   $ (18,300,000) $ (4,400,000)   $ (18,300,000)
Common Stock            
Equity, Class of Treasury Stock [Line Items]            
Increase (reduction) for retirement of shares held in treasury         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  
Retained Earnings            
Equity, Class of Treasury Stock [Line Items]            
Increase (reduction) for retirement of shares held in treasury         1,014,200,000  
Treasury Stock            
Equity, Class of Treasury Stock [Line Items]            
Increase (reduction) for retirement of shares held in treasury         $ (1,170,200,000)  
Shanghai Lear STEC Automotive Parts Co., Ltd            
Equity, Class of Treasury Stock [Line Items]            
Ownership percentage by noncontrolling owners 45.00%   45.00%     45.00%
Payments for repurchase of redeemable noncontrolling interest $ 95,500,000          
Retained earnings, undistributed earnings $ 26,800,000   $ 26,800,000     $ 26,800,000