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Restructuring and Related Activities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring Cost and Reserve    
Asset impairments $ 74 $ 0
Provision for income taxes (104) $ (207)
2018 Global Restructuring Program    
Restructuring Cost and Reserve    
Provision for income taxes (143)  
2018 Global Restructuring Program | Charges for workforce reductions    
Restructuring Cost and Reserve    
Restructuring Charges 418  
2018 Global Restructuring Program | After Tax    
Restructuring Cost and Reserve    
Restructuring Charges 434  
2018 Global Restructuring Program | After Tax | Parent    
Restructuring Cost and Reserve    
Restructuring Charges 428  
2018 Global Restructuring Program | After Tax | Equity Companies and Noncontrolling Interests    
Restructuring Cost and Reserve    
Restructuring Charges (6)  
2018 Global Restructuring Program | Before Tax    
Restructuring Cost and Reserve    
Restructuring Charges 577  
2018 Global Restructuring Program | Cost of Sales | Before Tax    
Restructuring Cost and Reserve    
Charges for workforce reductions 119  
Asset impairments 74  
Incremental depreciation 28  
Other exit costs 1  
Restructuring Charges 277  
2018 Global Restructuring Program | Cost of Sales | Before Tax | Asset write-offs    
Restructuring Cost and Reserve    
Restructuring Charges 55  
2018 Global Restructuring Program | Marketing, Research and General Expenses | Before Tax    
Restructuring Cost and Reserve    
Charges for workforce reductions 286  
Other exit costs 14  
Restructuring Charges $ 300