For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill	$ 290	$ 289	$ 290
Operating lease right-of-use assets	$ 100	$ 96	$ 100
Four Largest Customers \| Revenue from Contract with Customer \| Customer Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage		61.00%	58.00%
Four Largest Customers \| Accounts Receivable \| Customer Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage	39.00%	42.00%
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets				$ 75
Operating lease liabilities				$ 75