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Capital Structure - Common Stock (Details) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 21, 2020
Mar. 31, 2019
Feb. 27, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Quarterly dividends per share (usd per share)             $ 0.03 $ 0.03 $ 0.03
Dividends paid per share (in usd per share)             $ 0.12 $ 0.12 $ 0.12
Eligible compensation withholding, minimum, percentage   1.00%              
Eligible compensation withholding, maximum, percentage   10.00%         10.00%    
Exercise price as a percentage of fair value (as a percent)   95.00%         85.00%    
Treasury stock reserved for issuance under the ESPP (in shares)         2,885,060   2,885,060    
Shares repurchased (in shares)             36,301,882 35,234,664  
Long-term capital allocation policy, target allocation of cash generated allocated to growth investments, percentage         50.00%        
Long-term capital allocation, target allocation, cash generated allocated returned to shareholders, percentage         50.00%        
Capital Allocation Plan                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Stock repurchase program, authorized amount         $ 1,250,000,000   $ 1,250,000,000 $ 1,500,000,000  
Shares repurchased (in shares)             37,238,810 35,234,664  
2018 Capital Allocation Plan                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Shares repurchased (in shares)           250,000,000   1,250,000,000  
2019 Capital Allocation Plan                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Shares repurchased (in shares)             1,194,000,000    
Subsequent Event                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Dividends per common share (in usd per share) $ 0.30                
Subsequent Event | Capital Allocation Plan                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Shares repurchased (in shares)     3,138,081            
Subsequent Event | 2019 Capital Allocation Plan                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Shares repurchased (in shares)     56,000,000            
Scenario, Forecast                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Common stock, dividends, proposed annual amount, per share (usd per share)       $ 1.20          
Scenario, Forecast | Minimum                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Annual dividend growth rate, percentage       700.00%          
Scenario, Forecast | Maximum                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Annual dividend growth rate, percentage       9.00%          
Scenario, Plan | Subsequent Event                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Common stock, dividends, proposed annual amount, per share (usd per share) $ 1.20                
Long-term incentive plans                  
Common Stock, Employee Stock Purchase Plan and Share Repurchases                  
Long-term incentive plans (in shares)         16,029,127   16,029,127