Financial Instruments and Risk Management - Impact on Earnings (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	$ 80	$ (57)	$ 61	$ (60)
Gain (Loss) on Derivatives not Designated as Hedge Instruments	61	(5)	55	(24)
Amounts reclassified into earnings:
Commodity contracts	(17)	(9)	(24)	(14)
Cross currency swap contracts	(62)	66	(36)	74
Currency exchange contracts	(1)		(1)
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	80	(57)	61	(60)
Changes in accumulated other comprehensive earnings (loss) for effective derivatives	29	(20)	(14)	37
Commodity contracts
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	42	(28)	12	23
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	42	(28)	12	23
Commodity contracts | Net sales
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	(1)		(4)	(3)
Gain (Loss) on Derivatives not Designated as Hedge Instruments			1	(2)
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	(1)		(4)	(3)
Commodity contracts | Cost of sales
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	18	9	28	17
Gain (Loss) on Derivatives not Designated as Hedge Instruments	4	(4)	4	(3)
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	18	9	28	17
Interest rate contracts
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)				1
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net				1
Foreign currency contracts | Selling, general and administrative
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	1		1
Gain (Loss) on Derivatives not Designated as Hedge Instruments	68	(14)	57	(29)
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	1		1
Equity contracts | Selling, general and administrative
Impact on Earnings from Derivative Instruments
Gain (Loss) on Derivatives not Designated as Hedge Instruments	(11)	13	(7)	10
Cross-currency swap
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	71	(66)	32	(69)
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	71	(66)	32	(69)
Cross-currency swap | Interest expense.
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	3	5	6	10
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	3	5	6	10
Cross-currency swap | Selling, general and administrative
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	59	(71)	30	(84)
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	59	(71)	30	(84)
Currency exchange contract
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	(2)	2	(3)	1
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	(2)	2	(3)	1
Foreign currency and tax impacts
Impact on Earnings from Derivative Instruments
Cash Flow Hedge - Reclassified Amount from Accumulated Other Comprehensive Earnings (Loss)	(2)	15	6	21
Change in fair value of cash flow hedges:
Derivative, Gain (Loss) on Derivative, Net	$ (2)	$ 15	$ 6	$ 21