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Basis of Presentation and Significant Accounting Policies and Practices - Additional Information (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share, Amount (in shares) | 4 | 5 | 4 | 6 |
ASU 2014-09 |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Contract asset | $ 265 |  | $ 265 |  |
Revenue remaining performance obligation | $ 68 |  | $ 68 |  |
Revenue remaining performance obligation of percentage rate |  |  | 24.00% |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 12 months |  | 12 months |  |
Contract asset reduction | $ 18 |  | $ 18 |  |
Contract asset due to cash received |  |  | 30 |  |
Contract of income recognized |  |  | $ 12 |  |
ASU 2014-09 | Cumulative Impact of Adopting ASC 606 |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Cumulative impact of retained earnings, net of taxes |  |  |  |  | $ 206
Contract asset |  |  |  |  | 283
Deferred tax liabilities |  |  |  |  | $ 55

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