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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Inventories	$ 3,494	$ 2,980
Other noncurrent assets	2,009	$ 1,671
Revision of Prior Period, Reclassification, Adjustment
Inventories	302
Other noncurrent assets	$ (302)
Employee Stock Option
Vesting period	10 years
Restricted Stock Units (RSUs)
Performance period	3 years
Performance Stock Units (PSUs)
Vesting period	3 years
Minimum
Finite-lived intangible asset, useful life	4 years
Maximum
Finite-lived intangible asset, useful life	40 years
Building and Improvements | Minimum
Property, plant and equipment useful life	3 years
Building and Improvements | Maximum
Property, plant and equipment useful life	30 years
Machinery and Equipment | Minimum
Property, plant and equipment useful life	3 years
Machinery and Equipment | Maximum
Property, plant and equipment useful life	15 years

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