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Recent Accounting Pronouncements Adoption of ASU 2014-09 Textuals (Details) - Estimate of Revenue Recognized on Open Contracts Prior to Adoption of Revenue ASU [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Revenue [Member] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 49
Operating Income (Loss) [Member] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 5
Retained Earnings [Member] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 4

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