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Summary of Significant Accounting Principles and Practices - Schedule of Topic 606 Impact on Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 353 | $ 153 | $ 58 | $ 610 | $ (12) | $ 192 | $ 778 | $ 305 | $ 1,174 | $ 1,263 | $ 1,430
Receivables, net |  |  |  |  |  |  |  |  | 127 | 254 | 105
Accounts payable and accrued liabilities |  |  |  |  |  |  |  |  | 25 | 96 | 53
Current income taxes |  |  |  |  |  |  |  |  | 34 | (914) | (42)
Other assets and liabilities |  |  |  |  |  |  |  |  | (2) | $ 8 | $ (66)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (78) |  |
Receivables, net |  |  |  |  |  |  |  |  | (49) |  |
Accounts payable and accrued liabilities |  |  |  |  |  |  |  |  | 8 |  |
Current income taxes |  |  |  |  |  |  |  |  | (34) |  |
Other assets and liabilities |  |  |  |  |  |  |  |  | (55) |  |
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 1,096 |  |
Receivables, net |  |  |  |  |  |  |  |  | 78 |  |
Accounts payable and accrued liabilities |  |  |  |  |  |  |  |  | 33 |  |
Current income taxes |  |  |  |  |  |  |  |  | 0 |  |
Other assets and liabilities |  |  |  |  |  |  |  |  | $ (57) |  |

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