Earnings per share

12 Months Ended

Dec. 31, 2017

Earnings per share [abstract]

Earning per share

9 Earnings per share

Basic earnings per ordinary share is calculated by dividing the profit attributable to ordinary shareholders of the parent company by the weighted average number of ordinary shares outstanding, excluding own shares held. Diluted earnings per ordinary share is calculated by dividing the basic earnings, which require no adjustment for the effects of dilutive potential ordinary shares, by the weighted average number of ordinary shares outstanding, excluding own shares held, plus the weighted average number of ordinary shares that would be issued on conversion of dilutive potential ordinary shares.

Profit attributable to the ordinary shareholders of the parent company
	2017		2016		2015
	$m		$m		$m
Profit attributable to shareholders of the parent company	10,798		2,479		13,522
Dividend payable on preference shares classified as equity	(90	)	(90	)	(90	)
Coupon payable on capital securities classified as equity	(1,025	)	(1,090	)	(860	)
Year ended 31 Dec	9,683		1,299		12,572

Basic and diluted earnings per share
		2017			2016			2015
		Profit	Number of shares	Per share	Profit	Number of shares	Per share	Profit	Number of shares	Per share
	Footnote	$m	(millions)	$	$m	(millions)	$	$m	(millions)	$
Basic	1	9,683	19,972	0.48	1,299	19,753	0.07	12,572	19,380	0.65
Effect of dilutive potential ordinary shares			100			92			137
Diluted	1	9,683	20,072	0.48	1,299	19,845	0.07	12,572	19,517	0.64

1 Weighted average number of ordinary shares outstanding (basic) or assuming dilution (diluted).

The number of anti-dilutive employee share options excluded from the weighted average number of dilutive potential ordinary shares is nil (2016: 10m; 2015: 7m).