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Summary of Significant Accounting Policies (Supplemental Disclosure of Cash Flow Information) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract] |  |  |  |
Accruals for capital expenditures |  | $ 412 | $ 584 | $ 381
Interest | [1] | 205 | 178 | 184
Income taxes, net of refunds received |  | 567 | 405 | 293
Interest costs capitalized |  | $ 49 | $ 36 | $ 23
[1] | Included in this amount are approximately $49 million, $36 million, and $23 million of interest costs that were capitalized as part of property, plant and equipment, net of accumulated depreciation, in 2018, 2017 and 2016, respectively.

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