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Revenues - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Line Items]
Contract assets	$ 198	$ 144
Contract liabilities	97	45
Revenue recognized related to royalties for licenses of our intellectual property
Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Line Items]
Revenues recognized from performance obligations satisfied in prior years	841	741
Change in estimate variable consideration
Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Line Items]
Revenues recognized from performance obligations satisfied in prior years	$ 101	$ 257

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- Definition

[Line Items] for Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Table]

+ References

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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