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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, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Disclosure of Dividends [abstract] |  |  |
Prior year final dividend, Per share | $ 0.78 | $ 0.63 | $ 0.63
Interim dividend, Per share |  |  | 0.55
Special dividend, Per share |  |  | 1.02
Dividends paid during the period, Per share | $ 0.78 | $ 0.63 | $ 2.20
Prior year final dividend, Total | $ 3,946 | $ 3,356 | $ 3,356
Interim dividend, Total |  |  | 2,788
Special dividend, Total |  |  | 5,158
Dividends paid during the period, Total | $ 3,946 | $ 3,356 | $ 11,302

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- Definition The amount of dividends recognised as distributions to owners of the parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of dividends relating to the current year, recognised as distributions to owners of the parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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