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Summary of Significant Accounting Policies - Schedule of Effect of New Accounting Pronouncements (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Prepaid and other current assets | $ 2,171 | $ 1,757 | $ 1,661
Other long-term assets | 2,787 | 2,732 | 2,722
Other accrued liabilities | 2,333 | 3,255 | 3,370
Other long-term obligations | 594 | 589 | 558
Retained earnings | $ 20,706 | 19,202 | $ 19,012
Difference Between Revenue Guidance In Effect Before And After Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Prepaid and other current assets |  | 96 |
Other long-term assets |  | 10 |
Other accrued liabilities |  | (115) |
Other long-term obligations |  | 31 |
Retained earnings |  | $ 190 |

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