Restructuring and Related Implementation Charges (Details 3) (Two Thousand Twelve Restructuring Program [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]  
Pretax Charges Related To The Restructuring Program To Date $ 846
Aftertax Charges Related To The Restructuring Program To Date 623
Employee-Related Costs [Member]  
Restructuring Cost and Reserve [Line Items]  
Pretax Charges Related To The Restructuring Program To Date 330
Incremental Depreciation [Member]  
Restructuring Cost and Reserve [Line Items]  
Pretax Charges Related To The Restructuring Program To Date 57
Asset Impairment [Member]  
Restructuring Cost and Reserve [Line Items]  
Pretax Charges Related To The Restructuring Program To Date 2
Other Restructuring [Member]  
Restructuring Cost and Reserve [Line Items]  
Pretax Charges Related To The Restructuring Program To Date $ 457