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Equity - Accelerated Share Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions
2 Months Ended 3 Months Ended 7 Months Ended 12 Months Ended
Jan. 02, 2019
Oct. 29, 2018
Sep. 25, 2018
Mar. 06, 2018
Oct. 31, 2017
Aug. 01, 2017
Dec. 07, 2016
Sep. 07, 2016
Jan. 02, 2019
Oct. 31, 2017
Dec. 07, 2016
Sep. 25, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 11, 2019
Accelerated Share Repurchases [Line Items]                                
Average price paid per share (USD per share)                         $ 197.21 $ 147.74 $ 113.36  
Accelerated Share Repurchases, October 2018                                
Accelerated Share Repurchases [Line Items]                                
Authorized amount   $ 500,000,000                            
Accelerated share repurchase, settlement (payment) or receipt   $ (500,000,000)                            
Accelerated Share Repurchases, October 2018 | Initial Award                                
Accelerated Share Repurchases [Line Items]                                
Total number of shares purchased (shares)   2.5                            
Authorized amount repurchased (as a percent)   85.00%                            
Accelerated Share Repurchases, March 2018                                
Accelerated Share Repurchases [Line Items]                                
Authorized amount       $ 1,000,000,000                        
Accelerated share repurchase, settlement (payment) or receipt       $ (1,000,000,000)                        
Total number of shares purchased (shares)                       5.1        
Average price paid per share (USD per share)                       $ 197.49        
Accelerated Share Repurchases, March 2018 | Initial Award                                
Accelerated Share Repurchases [Line Items]                                
Total number of shares purchased (shares)       4.5                        
Authorized amount repurchased (as a percent)       85.00%                        
Accelerated Share Repurchases, March 2018 | Additional Award                                
Accelerated Share Repurchases [Line Items]                                
Total number of shares purchased (shares)     0.6                          
Accelerated Share Repurchases, August 2017                                
Accelerated Share Repurchases [Line Items]                                
Authorized amount           $ 500,000,000                    
Accelerated share repurchase, settlement (payment) or receipt           $ (500,000,000)                    
Total number of shares purchased (shares)                   3.2            
Average price paid per share (USD per share)                   $ 154.46            
Accelerated Share Repurchases, August 2017 | Initial Award                                
Accelerated Share Repurchases [Line Items]                                
Total number of shares purchased (shares)           2.8                    
Authorized amount repurchased (as a percent)           85.00%                    
Accelerated Share Repurchases, August 2017 | Additional Award                                
Accelerated Share Repurchases [Line Items]                                
Total number of shares purchased (shares)         0.5                      
Accelerated Share Repurchases, September 2016                                
Accelerated Share Repurchases [Line Items]                                
Authorized amount               $ 750,000,000                
Accelerated share repurchase, settlement (payment) or receipt               $ (750,000,000)                
Total number of shares purchased (shares)             0.9       6.1          
Average price paid per share (USD per share)                     $ 122.18          
Accelerated Share Repurchases, September 2016 | Initial Award                                
Accelerated Share Repurchases [Line Items]                                
Total number of shares purchased (shares)               4.4                
Accelerated Share Repurchases, September 2016 | Additional Award                                
Accelerated Share Repurchases [Line Items]                                
Total number of shares purchased (shares)               0.9                
Subsequent Event | Accelerated Share Repurchases, October 2018                                
Accelerated Share Repurchases [Line Items]                                
Total number of shares purchased (shares)                 2.9              
Average price paid per share (USD per share) $ 173.80                              
Subsequent Event | Accelerated Share Repurchases, October 2018 | Additional Award                                
Accelerated Share Repurchases [Line Items]                                
Total number of shares purchased (shares) 0.4                              
Subsequent Event | Accelerated Share Repurchases, February 2019                                
Accelerated Share Repurchases [Line Items]                                
Authorized amount                               $ 500,000,000