Restructuring and Related Implementation Charges (Details 3) - Global Growth and Efficiency Program $ in Millions	Sep. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Pretax charges related to the Restructuring Program to date	$ 1,474
Aftertax charges related to the Restructuring Program to date	1,092
Employee-Related Costs
Restructuring Cost and Reserve [Line Items]
Pretax charges related to the Restructuring Program to date	594
Incremental Depreciation
Restructuring Cost and Reserve [Line Items]
Pretax charges related to the Restructuring Program to date	88
Asset Impairments
Restructuring Cost and Reserve [Line Items]
Pretax charges related to the Restructuring Program to date	29
Other
Restructuring Cost and Reserve [Line Items]
Pretax charges related to the Restructuring Program to date	$ 763