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Restructuring and Related Implementation Charges - Summary of Restructuring Charges, Cumulative to Date (Details) - Global Growth and Efficiency Program
$ in Millions
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]  
Pretax charges related to the Restructuring Program to date $ 1,561
Employee-Related Costs  
Restructuring Cost and Reserve [Line Items]  
Pretax charges related to the Restructuring Program to date 628
Incremental Depreciation  
Restructuring Cost and Reserve [Line Items]  
Pretax charges related to the Restructuring Program to date 90
Asset Impairments  
Restructuring Cost and Reserve [Line Items]  
Pretax charges related to the Restructuring Program to date 36
Other  
Restructuring Cost and Reserve [Line Items]  
Pretax charges related to the Restructuring Program to date $ 807