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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