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v3.19.1

Revenue Recognition (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Revenue recognized which was included in the contract liability balance | $ 139
Minimum |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Remaining revenue performance obligation, optional exemption, contract term | 3 years
Maximum |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Remaining revenue performance obligation, optional exemption, contract term | 5 years

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