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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Basis of Presentation and Significant Accounting Policies (Textual) |  |  |  |  |
Operating expenses (excluding depreciation and amortization expense) |  | $ 1,193 | $ 1,135 | $ 3,439 | $ 3,370
General and administrative expenses (excluding depreciation and amortization expense) |  | $ 209 | 225 | 695 | 592
Reclassification of stranded income tax effects of Tax Reform to retained earnings per ASU 2018-02 |  |  |  | $ 0 |
Accounting Standards Update 2017-07 [Member] |  |  |  |  |
Basis of Presentation and Significant Accounting Policies (Textual) |  |  |  |  |
Operating expenses (excluding depreciation and amortization expense) |  |  | 10 |  | 31
General and administrative expenses (excluding depreciation and amortization expense) |  |  | $ (4) |  | $ (5)
Accounting Standards Update 2018-02 [Member] |  |  |  |  |
Basis of Presentation and Significant Accounting Policies (Textual) |  |  |  |  |
Reclassification of stranded income tax effects of Tax Reform to retained earnings per ASU 2018-02 | $ 91 |  |  |  |
Minimum [Member] |  |  |  |  |
Basis of Presentation and Significant Accounting Policies (Textual) |  |  |  |  |
Typical post-delivery payment terms (in days) |  |  |  | 2 days |
Maximum [Member] |  |  |  |  |
Basis of Presentation and Significant Accounting Policies (Textual) |  |  |  |  |
Typical post-delivery payment terms (in days) |  |  |  | 10 days |

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