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Equity - Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 27, 2020
Jul. 31, 2019
Feb. 29, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total cash utilized         $ 1,153   $ 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)       0.0     0.5  
Average price paid per share (USD per share)       $ 0     $ 291.99  
Total cash utilized             $ 1,150  
Total cash utilized       $ 0     $ 150  
2013 Repurchase Program                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total number of shares purchased (shares)           0.0   0.8
Average price paid per share (USD per share)           $ 0   $ 184.51
Total cash utilized           $ 0   $ 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)             $ 292.13  
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       0.4  
Accelerated Share Repurchases, February 2020 | Additional Award | Subsequent Event                
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)             1.7  
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)             $ 292.13  
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)             0.3  
Accelerated Share Repurchases, February 2020 #2 | Additional Award | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total number of shares purchased (shares) 0.3              
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)             1.7  
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)             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         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