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Accounting Principles and Practices - Schedule of Impact of Topic 606 on Cash Flow Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities |  |  |  |
Net income | $ 58 | $ 778 | $ 668 | $ 1,083
Deferred income taxes |  |  | (93) | (227)
Receivables, net |  |  | (371) | (25)
Accounts payable and accrued liabilities |  |  | (495) | (377)
Current income taxes |  |  | (144) | (25)
Other assets and liabilities |  |  | 301 | $ 30
Accounting Standards Update 2014-09 | Adjustments |  |  |  |
Cash flows from operating activities |  |  |  |
Net income |  |  | (259) |
Deferred income taxes |  |  | (29) |
Receivables, net |  |  | 405 |
Accounts payable and accrued liabilities |  |  | 8 |
Current income taxes |  |  | (46) |
Other assets and liabilities |  |  | (79) |
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Cash flows from operating activities |  |  |  |
Net income |  |  | 409 |
Deferred income taxes |  |  | (122) |
Receivables, net |  |  | 34 |
Accounts payable and accrued liabilities |  |  | (487) |
Current income taxes |  |  | (190) |
Other assets and liabilities |  |  | $ 222 |

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