Derivatives - Cash Flow Hedges - Gain (Loss) in OCI or Reclassified from AOCI (Details) - Cash flow hedge - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Derivative	$ (26)	$ (15)	$ 40	$ 62
Pretax Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	(12)	31	(21)	47
Foreign currency exchange contracts
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Derivative	(26)	(15)	40	64
Foreign currency exchange contracts \| Cost of sales
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	(10)	33	(17)	51
Interest rate contracts
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Derivative				(2)
Interest rate contracts \| Interest expense
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	$ (2)	$ (2)	$ (4)	$ (4)

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580

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