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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Millions |  | 3 Months Ended
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Jan. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements |  |  |
Operating expenses (excluding depreciation and amortization expense reflected below) |  | $ 1,136 | $ 1,124
General and administrative expenses (excluding depreciation and amortization expense reflected below) |  | $ 238 | 192
Accounting Standards Update 2017-07 [Member] |  |  |
New Accounting Pronouncements |  |  |
Operating expenses (excluding depreciation and amortization expense reflected below) |  |  | 7
General and administrative expenses (excluding depreciation and amortization expense reflected below) |  |  | $ 2
Accounting Standards Update 2018-02 [Member] |  |  |
New Accounting Pronouncements |  |  |
Reclassification of stranded income tax effects of Tax Reform to retained earnings per ASU 2018-02 | $ 91 |  |

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