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Restructuring Charges - Change in Restructuring Liability (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Reserve [Roll Forward]        
Restructuring reserve, balance at beginning of period     $ 173  
Charges to Earnings $ 7 $ 63 35 $ 186
Cash Paid     (89)  
Non-Cash and Other     (7)  
Restructuring reserve, balance at end of period 112   112  
Employee termination costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, balance at beginning of period     145  
Charges to Earnings     32  
Cash Paid     (72)  
Non-Cash and Other     0  
Restructuring reserve, balance at end of period 105   105  
Asset impairment costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, balance at beginning of period     8  
Charges to Earnings     1  
Cash Paid     0  
Non-Cash and Other     (1)  
Restructuring reserve, balance at end of period 8   8  
Facility exit costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, balance at beginning of period     0  
Charges to Earnings     1  
Cash Paid     (1)  
Non-Cash and Other     0  
Restructuring reserve, balance at end of period 0   0  
Other exit costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, balance at beginning of period     20  
Charges to Earnings     1  
Cash Paid     (16)  
Non-Cash and Other     (6)  
Restructuring reserve, balance at end of period $ (1)   $ (1)