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Company Restructuring - Restructuring Programs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]          
Restructuring and related charges $ 71 $ 13 $ 122 $ 17  
Future work environment          
Restructuring Cost and Reserve [Line Items]          
Expected program charges 110   110    
Restructuring and related charges     (79)   $ 0
Change in estimated program costs 0   0    
Remaining program charges 31   31    
Transformative Growth          
Restructuring Cost and Reserve [Line Items]          
Expected program charges 290   290    
Restructuring and related charges     1   $ (238)
Change in estimated program costs (40)   (40)    
Remaining program charges $ 13   $ 13