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Restructuring Charges (Changes to Restructuring Liability) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance $ 96 $ 162  
Charge to Earnings 188 247 $ 275
Cash Paid (146) (265)  
Non-Cash and Other (61) (48)  
Restructuring reserve, ending balance 77 96 162
Employee termination costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 84 131  
Charge to Earnings 84 155  
Cash Paid (111) (202)  
Non-Cash and Other 0 0  
Restructuring reserve, ending balance 57 84 131
Asset impairment costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 0 0  
Charge to Earnings 74 43  
Cash Paid (7) 0  
Non-Cash and Other (59) (43)  
Restructuring reserve, ending balance 8 0 0
Facility exit costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance (9) 2  
Charge to Earnings 22 41  
Cash Paid (23) (52)  
Non-Cash and Other 0 0  
Restructuring reserve, ending balance (10) (9) 2
Other exit costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 21 29  
Charge to Earnings 8 8  
Cash Paid (5) (11)  
Non-Cash and Other (2) (5)  
Restructuring reserve, ending balance $ 22 $ 21 $ 29