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Summary of Significant Accounting Principles and Practices - Schedule of Topic 606 Impact on the Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Receivables, net | $ 2,760 | $ 2,730 | $ 2,478 |  |
Other current assets | 618 | 587 | 289 |  |
Deferred tax assets | 561 | 261 | 389 |  |
Other non-current assets | 448 | 452 | 307 |  |
Liabilities |  |  |  |  |
Accounts payable and accrued liabilities | 10,166 | 1,969 | 9,625 |  |
Other current liabilities | 936 | 883 | 870 |  |
Deferred tax liabilities | 181 | 169 | 127 |  |
Other non-current liabilities | 1,097 | 1,099 | 1,102 |  |
Equity |  |  |  |  |
Total equity | 4,219 | 5,155 | 4,648 | $ 5,532 | $ 6,059
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Assets |  |  |  |  |
Receivables, net |  |  | 2,478 |  |
Other current assets |  |  | 289 |  |
Deferred tax assets |  |  | 389 |  |
Other non-current assets |  |  | 307 |  |
Liabilities |  |  |  |  |
Accounts payable and accrued liabilities |  |  | 1,961 |  |
Other current liabilities |  |  | 870 |  |
Deferred tax liabilities |  |  | 127 |  |
Other non-current liabilities |  |  | 1,102 |  |
Equity |  |  |  |  |
Total equity |  |  | $ 4,648 |  |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |
Assets |  |  |  |  |
Receivables, net | (301) | 252 |  |  |
Other current assets | (319) | 298 |  |  |
Deferred tax assets | 137 | (128) |  |  |
Other non-current assets | (155) | 145 |  |  |
Liabilities |  |  |  |  |
Accounts payable and accrued liabilities |  | 8 |  |  |
Other current liabilities | (43) | 13 |  |  |
Deferred tax liabilities | (28) | 42 |  |  |
Other non-current liabilities | 2 | (3) |  |  |
Equity |  |  |  |  |
Total equity | (569) | $ 507 |  |  |
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Assets |  |  |  |  |
Receivables, net | 2,459 |  |  |  |
Other current assets | 299 |  |  |  |
Deferred tax assets | 698 |  |  |  |
Other non-current assets | 293 |  |  |  |
Liabilities |  |  |  |  |
Other current liabilities | 893 |  |  |  |
Deferred tax liabilities | 153 |  |  |  |
Other non-current liabilities | 1,099 |  |  |  |
Equity |  |  |  |  |
Total equity | $ 3,650 |  |  |  |

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