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Revenues Revenues Recognized from Performance Obligations Satisfied in Prior Periods (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Abstract]
Revenues Recognized from Performance Obligations Satisfied in Prior Periods	$ 188	$ 155
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 38	$ 107

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- Definition

Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Abstract]

+ References

No definition available.

+ Details

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- Definition

Revenues recognized from performance obligations satisfied in previous periods

+ References

No definition available.

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- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12A
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL108322424-203045

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