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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Inputs, Level 3
Investment [Line Items]
Fair value of line of credit	$ 28	$ 29
Fair value | Fair Value, Inputs, Level 2
Investment [Line Items]
Total debt	23,300	6,000
Carrying value
Investment [Line Items]
Total debt	$ 22,200	$ 6,000

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- References

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

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