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Capital Stock and Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Apr. 25, 2013
Jan. 31, 2013
Dec. 31, 2013
Director
Vote
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Director
Vote
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Director
Vote
Feb. 07, 2014
Subsequent Event
Dividend Declared
Dec. 31, 2013
Additional Paid-in Capital
Jun. 29, 2013
Additional Paid-in Capital
Dec. 31, 2013
Common Stock
Dec. 31, 2013
Retained Earnings
Dec. 31, 2013
Treasury Stock
Jan. 31, 2013
Additional Authorization
Feb. 28, 2013
2013 Share Repurchase Program
Apr. 30, 2013
Two-Year Stock Repurchase Program
Stockholders Equity Note [Line Items]                                              
Common stock, shares authorized     300,000,000       300,000,000       300,000,000 300,000,000   300,000,000                  
Common stock holders voting right, vote per outstanding share     1               1     1                  
Common Stock Share Repurchase Program, description   Common Stock Share Repurchase Program In January 2013, the Company's Board of Directors authorized an increase of $800 million to the Company's existing common stock share repurchase program, which permits the discretionary repurchase of the Company's common stock, to provide for aggregate repurchases of $1.5 billion and extended the term of the program to January 10, 2016.                                          
Common stock, aggregate authorized repurchase amount   $ 1,500                                     $ 800 $ 600 $ 750
Number of directors     3               3     3                  
Accelerated stock repurchase agreement amount 800                                            
Amount paid in accelerated stock repurchase agreement         800                                    
Common stock, repurchased         11,862,836           15,533,758 5,357,443 6,182,429                    
Percentage of treasury stock repurchased         80.00%                       20.00%            
Value of common stock repurchased, per share         $ 53.95                                    
Value of common stock repurchased                     1,000.1 222.8 279.1 1,500.0     160.0            
Common stock, share repurchase program amount                     750                        
Common stock, at an average purchase price excluding commission                     $ 54.08 $ 41.59 $ 45.15                    
Repurchase of common stock                     1,000.1 222.8 279.1                    
Shares held in treasury authorized to be retired     20,000,000               20,000,000     20,000,000                  
Retirement of shares held in treasury                               389.7   0.2 600.7 990.6      
Dividends payable, per share                             $ 0.20                
Dividend declared date                             Feb. 07, 2014                
Dividend payable date                             Mar. 20, 2014                
Dividend record date                             Feb. 28, 2014                
Cash dividends declared per share     $ 0.17 $ 0.17 $ 0.17 $ 0.17 $ 0.14 $ 0.14 $ 0.14 $ 0.14                          
Dividends declared to Lear Corporation stockholders                     59.4 56.1 52.9                    
Dividends paid to Lear Corporation stockholders                     $ 58.4 $ 54.6 $ 51.1                    
Warrants outstanding     279,094       377,091       279,094 377,091   279,094                  
Exercisable of warrants into common stock     558,188       754,182       558,188 754,182   558,188                  
Exercise price of Warrants     0.005               0.005     0.005                  
Warrant expiration date     Nov. 09, 2014               Nov. 09, 2014     Nov. 09, 2014