Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	$ 212	$ 217	$ 759	$ 770
Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	61	12	172	100
Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	33	31	210	125
Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	118	174	377	545
Materials and production
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	36	70	149	280
Materials and production | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0	0	0
Materials and production | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	18	17	69	47
Materials and production | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	18	53	80	233
Marketing and administrative
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	1	17	91	70
Marketing and administrative | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0	0	0
Marketing and administrative | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	1	5	8	53
Marketing and administrative | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	12	83	17
Research and development
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	14	17	133	34
Research and development | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0	0	0
Research and development | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	14	9	133	25
Research and development | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	8	0	9
Restructuring costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	161	113	386	386
Restructuring costs | Separation Costs
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	61	12	172	100
Restructuring costs | Accelerated Depreciation
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	0	0	0	0
Restructuring costs | Other
Restructuring Cost and Reserve [Line Items]
Total pretax restructuring costs	$ 100	$ 101	$ 214	$ 286