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Organization and Basis of Presentation (New Accounting Standards) (Details) - Accounting Standards Update 2017-07 [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating income and expenses, net [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New accounting pronouncement, quantified affect | $ 156 | $ 131 | $ 96
Nonoperating income and expenses, net [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
New accounting pronouncement, quantified affect | $ 156 | $ 131 | $ 96

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