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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2019 | Mar. 31, 2019
Basis of Presentation and Significant Accounting Policies (Textual) |  |  |
ROU assets for operating leases | [1] |  | $ 1,430
Topic 842 [Member] |  |  |
Basis of Presentation and Significant Accounting Policies (Textual) |  |  |
ROU assets for operating leases |  | $ 1,300 |
Topic 842 [Member] | MVP Terminal [Member] |  |  |
Basis of Presentation and Significant Accounting Policies (Textual) |  |  |
Derecognition of existing assets under construction related to build-to-suit lease arrangement |  | $ 539 |
[1] | Includes noncash activity of $1.3 billion for ROU assets for operating leases recorded on January 1, 2019 upon adoption of Topic 842.

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