Organization and Operations Organization and Operations (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Mar. 08, 2018 |
|
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |||||
| Sale of Stock, Price Per Share | $ 15.25 | ||||
| Sale of Stock, Consideration Received on Transaction | $ 5,600 | ||||
| Payments for Merger Related Costs | $ 0 | $ 33 | $ 15 | ||