Share capital and premium (Tables)

6 Months Ended

Jun. 30, 2021

Share Capital, Reserves And Other Equity Interest [Abstract]

Disclosure of share capital

		As at	As at	As at
		Jun	Jun	Dec
		2021	2020	2020
US Dollar million		Unaudited	Unaudited	Audited
Share capital
Authorised:
	600,000,000 ordinary shares of 25 SA cents each	23	23	23
	2,000,000 A redeemable preference shares of 50 SA cents each	—	—	—
	5,000,000 B redeemable preference shares of 1 SA cents each	—	—	—
	30,000,000 C redeemable preference shares at no par value	—	—	—
		23	23	23
Issued and fully paid:
	417,345,340 (Dec 2020: 416,603,645; Mar 2020: 416,890,087) ordinary shares in issue of 25 SA cents each	17	17	17
	2,000,000 A redeemable preference shares of 50 SA cents each	—	—	—
	778,896 B redeemable preference shares of 1 SA cent each	—	—	—
		17	17	17
	Treasury shares held within the group
	2,778,896 A and B redeemable preference shares	—	—	—
		17	17	17
Share premium
Balance at beginning of period		7,250	7,235	7,235
Ordinary shares issued		7	12	15
		7,257	7,247	7,250
Less: held within the group
Redeemable preference shares		(53)	(53)	(53)
Balance at end of period		7,204	7,194	7,197
Share capital and premium		7,221	7,211	7,214