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Discontinued Operations - Summary of Cash Flows from Discontinued Operations (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Net operating cash flows | $ 565 | $ 350 | $ 900
Net investing cash flows | (443) | (301) | (861)
Net financing cash flows | (13) | (27) | (40)
Net increase/(decrease) in cash and cash equivalents from Discontinued operations | 109 | 22 | (1)
Less Cash and cash equivalents | (15,575) |  | (15,871)
Proceeds from divestment of Onshore US, net of its cash | 6,924 |  |
Discontinued operations [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Net proceeds received from the sale of Onshore US | 7,028 |  |
Less Cash and cash equivalents | (104) |  |
Proceeds from divestment of Onshore US, net of its cash | 6,924 |  |
Total cash impact | $ 7,033 | $ 22 | $ (1)

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