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Restructuring - Charges and Spending Relating to Restructuring Activities by Program (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance $ 534 $ 747  
Expenses 927 658 $ 927
(Payments) receipts, net (461) (887)  
Non-cash activity (241) 16  
Restructuring reserve, ending balance 759 534 747
Separation Costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 443 619  
Expenses 572 473 552
(Payments) receipts, net (325) (649)  
Non-cash activity 0 0  
Restructuring reserve, ending balance 690 443 619
Accelerated Depreciation      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 0 0  
Expenses 233 (1) 60
(Payments) receipts, net 0 0  
Non-cash activity (233) 1  
Restructuring reserve, ending balance 0 0 0
Other      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 91 128  
Expenses 122 186 315
(Payments) receipts, net (136) (238)  
Non-cash activity (8) 15  
Restructuring reserve, ending balance $ 69 $ 91 $ 128