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Background and Basis of Presentation (Narrative) (Details) - USD ($)
3 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
Apr. 29, 2021
Jun. 30, 2021
Apr. 29, 2021
Jun. 30, 2021
Dec. 31, 2020
Jan. 31, 2021
Apr. 30, 2020
Jul. 31, 2019
Equity, Class of Treasury Stock [Line Items]                
Payments to acquire additional interest in subsidiaries     $ 250,000,000          
July 2019 Share Repurchase Program [Member]                
Equity, Class of Treasury Stock [Line Items]                
Planned share repurchase program               $ 1,000,000,000.0
Stock repurchase program, rescinded authorized repurchase amount             $ 500,000,000  
Repurchase of common stock (shares)         0      
January 2021 Share Repurchase Program [Member]                
Equity, Class of Treasury Stock [Line Items]                
Planned share repurchase program           $ 2,000,000,000.0    
Repurchase of common stock (shares)   6,600,000   13,500,000        
Stock repurchase program, remaining authorized repurchase amount   $ 1,350,000,000   $ 1,350,000,000        
Helix Innovations LLC [Member]                
Equity, Class of Treasury Stock [Line Items]                
Noncontrolling interest, remaining interest purchased by parent     20.00%          
Subsidiary ownership percentage 100.00%              
Subsidiary ownership percentage 100.00%