Impairments and other charges (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated		14,000
Venezuela trade receivables exchanged for promissory note	$ 200	$ 200
Impairments and other charges		3,357	$ 2,177	$ 129
Fixed asset impairments		2,550	760	47
Severance Costs		315	352	28
Inventory Write-down		166	484	24
Intangible asset impairments (excluding goodwill)		88	212	10
Other Restructuring Costs		67	201	20
Venezuela promissory note loss	$ 148	148	0	0
Country closure		39	80	0
Restructuring charges-other matters		$ (16)	$ 88	$ 0