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Restructuring - Charges and Spending Relating to Restructuring Activities by Program (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance $ 747 $ 541  
Expenses 658 927 $ 1,069
(Payments) receipts, net (887) (722)  
Non-cash activity 16 1  
Restructuring reserve, ending balance 534 747 541
Separation Costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 619 395  
Expenses 473 552 216
(Payments) receipts, net (649) (328)  
Non-cash activity 0 0  
Restructuring reserve, ending balance 443 619 395
Accelerated Depreciation      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 0 0  
Expenses (1) 60 227
(Payments) receipts, net 0 0  
Non-cash activity 1 (60)  
Restructuring reserve, ending balance 0 0 0
Other      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 128 146  
Expenses 186 315 626
(Payments) receipts, net (238) (394)  
Non-cash activity 15 61  
Restructuring reserve, ending balance $ 91 $ 128 $ 146