Supplementary Information - Condensed Consolidating Financial Information (Tables) |
12 Months Ended |
|---|---|
Dec. 31, 2019 | |
| Supplementary Information - Condensed Consolidating Financial Information [Abstract] | |
| Condensed Consolidated Income Statement | Millions of Dollars Millions of Dollars |
| Schedule of Condensed Balance Sheet | Millions of Dollars |
| Condensed Consolidated Statement of Cash Flows | Millions of Dollars Millions of Dollars |