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Dividends - Summary of Dividends Paid (Detail) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Disclosure of Dividends [abstract] |  |  |
Prior year final dividend, Per share | $ 0.63 | $ 0.43 | $ 0.43
Interim dividend, Per share |  |  | 0.55
Dividends paid during the period, Per share | $ 0.63 | $ 0.43 | $ 0.98
Prior year final dividend, Total | $ 3,356 | $ 2,291 | $ 2,291
Interim dividend, Total |  |  | 2,930
Dividends paid during the period, Total | $ 3,356 | $ 2,291 | $ 5,221

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