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Shareholders' Equity - Accelerated Share Repurchase Activity and Related Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 4 Months Ended
Mar. 31, 2018
Dec. 30, 2017
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
November 2017 ASR                
Accelerated Share Repurchases [Line Items]                
ASR purchase period end date     2018-02          
Number of shares repurchased (in shares) 5,700 23,600 29,269          
Average repurchase price per share (in dollars per share)     $ 170.84          
ASR amount     $ 5,000          
August 2017 ASR                
Accelerated Share Repurchases [Line Items]                
ASR purchase period end date       2017-11        
Number of shares repurchased (in shares)       18,887        
Average repurchase price per share (in dollars per share)       $ 158.84        
ASR amount       $ 3,000        
May 2017 ASR                
Accelerated Share Repurchases [Line Items]                
ASR purchase period end date         2017-08      
Number of shares repurchased (in shares)         20,108      
Average repurchase price per share (in dollars per share)         $ 149.20      
ASR amount         $ 3,000      
February 2017 ASR                
Accelerated Share Repurchases [Line Items]                
ASR purchase period end date           2017-05    
Number of shares repurchased (in shares)           20,949    
Average repurchase price per share (in dollars per share)           $ 143.20    
ASR amount           $ 3,000    
November 2016 ASR                
Accelerated Share Repurchases [Line Items]                
ASR purchase period end date             2017-02  
Number of shares repurchased (in shares)             51,157  
Average repurchase price per share (in dollars per share)             $ 117.29  
ASR amount             $ 6,000  
August 2016 ASR                
Accelerated Share Repurchases [Line Items]                
ASR purchase period end date               2016-11
Number of shares repurchased (in shares)               26,850
Average repurchase price per share (in dollars per share)               $ 111.73
ASR amount               $ 3,000