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Summary of Significant Accounting Policies (Recent Accounting and Reporting Pronouncements) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of change in accounting principle |  | $ 60 |
ASU 2016-09, Excess Tax Benefit Component |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred income tax assets, net |  |  | $ 60
ASU 2017-07 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reversal of net periodic benefit cost | $ 50 | 38 |
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of change in accounting principle |  | $ 60 |
Retained Earnings | ASU 2016-09, Excess Tax Benefit Component |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of change in accounting principle |  |  | $ 60

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