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Cost Reduction Programs and Other Charges - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
employee
Dec. 31, 2019
USD ($)
employee
Dec. 31, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]      
Cost reduction programs and other charges $ 506 $ 567 $ 309
Cost reduction programs and other charges, after-tax and noncontrolling interest 372 444 306
Cost reduction program charges 391 304  
Cost reduction program charges, net of tax $ 277 $ 233  
Number of positions eliminated | employee 3,100 2,400  
Other charges, merger related $ 115 $ 263 309
Other charges, merger related, net of tax 95 211 306
Asset impairment charges   73  
Asset impairment charges, net of tax   42  
Other charges, non-merger related     73
Cash requirement for the cost reduction program and other charges 390    
Cash payments 221 260  
Severance costs      
Restructuring Cost and Reserve [Line Items]      
Cost reduction programs and other charges 298 204  
Other cost reduction charges      
Restructuring Cost and Reserve [Line Items]      
Cost reduction programs and other charges $ 93 $ 100  
Other Charges, China Unfavorable Arbitration Ruling Charge      
Restructuring Cost and Reserve [Line Items]      
Cost reduction program charges, net of tax     40
Other charges, non-merger related     40
Other Charges, Restructuring Charges      
Restructuring Cost and Reserve [Line Items]      
Cost reduction program charges, net of tax     18
Other charges, non-merger related     21
Other Charges, Argentina Hyper-Inflation Charge      
Restructuring Cost and Reserve [Line Items]      
Cost reduction program charges, net of tax     12
Other charges, non-merger related     $ 12