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Capital Structure - Common Stock (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 21, 2021
Mar. 31, 2019
Feb. 27, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]                  
Quarterly dividends per share (usd per share)             $ 0.30 $ 0.03 $ 0.03
Dividends paid per share (in usd per share)             $ 1.20 0.12 $ 0.12
Common stock, dividends, proposed annual amount, per share (usd per share)       $ 1.20       $ 0.12  
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%        
Eligible compensation withholding, minimum, percentage   1.00%              
Eligible compensation withholding, maximum, percentage   10.00%         10.00%    
Market value on offering date percentage           95.00%      
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)             2,753,591    
Shares repurchased (in shares)             6,062,783 36,301,882 35,234,664
Capital Allocation Plan                  
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase program, authorized amount         $ 1,250,000,000     $ 1,250,000,000 $ 1,500,000,000
Shares repurchased (in shares)             6,774,031 37,238,810 35,234,664
2018 Capital Allocation Plan                  
Equity, Class of Treasury Stock [Line Items]                  
Shares repurchased (in shares)           250,000,000     1,250,000,000
2019 Capital Allocation Plan                  
Equity, Class of Treasury Stock [Line Items]                  
Shares repurchased (in shares)     56,000,000         1,194,000,000  
Subsequent Event                  
Equity, Class of Treasury Stock [Line Items]                  
Dividends per common share (in usd per share) $ 0.325                
Scenario, Plan | Subsequent Event                  
Equity, Class of Treasury Stock [Line Items]                  
Common stock, dividends, proposed annual amount, per share (usd per share) $ 1.30                
Common stock, annual dividends increase, percentage 8.00%                
Minimum                  
Equity, Class of Treasury Stock [Line Items]                  
Annual dividend growth rate, percentage         700.00%        
Maximum                  
Equity, Class of Treasury Stock [Line Items]                  
Annual dividend growth rate, percentage         9.00%        
Long-term incentive plans                  
Equity, Class of Treasury Stock [Line Items]                  
Long-term incentive plans (in shares)             14,862,069