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Cost Reduction Programs and Other Charges - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]        
Cost reduction programs and other charges $ 48 $ 125 $ 428 $ 355
Cost reduction programs and other charges, after-tax and noncontrolling interest 36 90 318 284
Merger-related divestitures   92   213
Other charges, merger related, net of tax   64   169
Cash requirement for the cost reduction program and other charges 338   338  
Severance costs        
Restructuring Cost and Reserve [Line Items]        
Cost reduction programs and other charges   33   142
Cost reduction programs and other charges, after-tax and noncontrolling interest   $ 26   115
Merger-related and other charges        
Restructuring Cost and Reserve [Line Items]        
Cost reduction programs and other charges 9   98  
Other charges, merger related, net of tax 7   82  
Other merger related charges for an asset impairment 73     73
Other merger related charges for an asset impairment net of tax and noncontrolling interest 42     $ 42
Cost Reduction Program        
Restructuring Cost and Reserve [Line Items]        
Cost reduction programs and other charges 39   330  
Cost reduction program charges 39   330  
Cost reduction program charges, net of tax 29   236  
Cost Reduction Program | Severance costs        
Restructuring Cost and Reserve [Line Items]        
Cost reduction programs and other charges 31   281  
Cost Reduction Program | Other cost reduction charges        
Restructuring Cost and Reserve [Line Items]        
Cost reduction programs and other charges $ 8   $ 49