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Discontinued Operations - Summary of Cash Flows from Discontinued Operations (Parenthetical) (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] |  |  |
Purchases of property, plant and equipment | $ 2,661 | $ 2,078 | $ 4,979
Proceeds from sale of assets | 102 | 72 | 89
Other investing outflow | 61 | 138 | 141
Net repayment of interest bearing liabilities | 1,739 | 4,008 | 4,188
Dividends paid to non-controlling interests | 623 | 925 | 1,582
Discontinued operations [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Purchases of property, plant and equipment | 443 | 335 | 900
Proceeds from sale of assets | 0 | 35 | 39
Other investing outflow | 0 | 1 | 0
Net repayment of interest bearing liabilities | 6 | 2 | 4
Distribution (contribution) to non-controlling interests |  | 6 | 14
Dividends paid to non-controlling interests | $ 7 | $ 19 | $ 22

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