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Equity - Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Jul. 31, 2019
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total cash utilized     $ 1,153 $ 644
Total cash utilized     $ 1,153 $ 644
2020 Repurchase Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)     0.5  
Average price paid per share (USD per share)     $ 291.99  
Total cash utilized   $ 1,150    
Total cash utilized     $ 150  
2013 Repurchase Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)       0.8
Average price paid per share (USD per share)       $ 184.51
Total cash utilized       $ 144
Accelerated Share Repurchases, February 2020        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average price paid per share (USD per share)     $ 0  
Accelerated Share Repurchases, February 2020 | Initial Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)     1.3  
Accelerated Share Repurchases, February 2020 | Additional Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)     0.2  
Accelerated Share Repurchases, February 2020 | Completed Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)     1.5  
Total cash utilized     $ 500  
Accelerated Share Repurchases, February 2020 #2        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average price paid per share (USD per share)     $ 0  
Accelerated share repurchases initial delivery percentage (as a percent)     85.00%  
Accelerated Share Repurchases, February 2020 #2 | Initial Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)     1.4  
Accelerated Share Repurchases, February 2020 #2 | Additional Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)     0.0  
Accelerated Share Repurchases, February 2020 #2 | Completed Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)     1.4  
Total cash utilized     $ 500  
Accelerated Share Repurchases, February 2019        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average price paid per share (USD per share)     $ 214.65  
Accelerated share repurchases initial delivery percentage (as a percent)     85.00%  
Accelerated Share Repurchases, February 2019 | Initial Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares) 0.1   2.2  
Accelerated Share Repurchases, February 2019 | Additional Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)     0.1  
Accelerated Share Repurchases, February 2019 | Completed Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased (shares)     2.3  
Total cash utilized     $ 500