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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Schedule of Effect of New Accounting Pronouncements | The cumulative effect of the changes made to our Condensed Consolidated Balance Sheets at January 1, 2018 for the adoption of Topic 606 was as follows (in millions):
|  | December 31, 2017 |  | Adjustments Due to Topic 606 |  | January 1, 2018
Prepaid and other current assets |  | $ | 1,661 |  |  | $ | 96 |  |  | $ | 1,757 |
Other long-term assets |  | $ | 2,722 |  |  | $ | 10 |  |  | $ | 2,732 |
Other accrued liabilities |  | $ | 3,370 |  |  | $ | (115 | ) |  | $ | 3,255 |
Other long-term obligations |  | $ | 558 |  |  | $ | 31 |  |  | $ | 589 |
Retained earnings |  | $ | 19,012 |  |  | $ | 190 |  |  | $ | 19,202 |

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