Called-up share capital (Tables)

12 Months Ended

Dec. 31, 2018

Share Capital, Reserves And Other Equity Interest [Abstract]

Disclosure of classes of share capital

The allotted, called up and fully paid share capital at 31 December was as follows:

			2018				2017			2016
Issued	Shares thousand		$ million		Shares thousand		$ million		Shares thousand	$ million
8% cumulative first preference shares of £1 eacha	7,233		12		7,233		12		7,233	12
9% cumulative second preference shares of £1 eacha	5,473		9		5,473		9		5,473	9
			21				21			21
Ordinary shares of 25 cents each
At 1 January	21,288,193		5,322		21,049,696		5,263		20,108,771	5,028
Issue of new shares for the scrip dividend programme	195,305		49		289,789		72		548,005	137
Issue of new shares for employee share-based payment plans	92,168		23		—		—		—	—
Issue of new shares – otherb	—		—		—		—		392,920	98
Repurchase of ordinary share capital	(50,202	)	(13	)	(51,292	)	(13	)	—	—
At 31 December	21,525,464		5,381		21,288,193		5,322		21,049,696	5,263
			5,402				5,343			5,284

^a The nominal amount of 8% cumulative first preference shares and 9% cumulative second preference shares that can be in issue at any time shall not exceed £10,000,000 for each class of preference shares.

^b  2016 relates to the issue of new ordinary shares in consideration for a 10% interest in the Abu Dhabi onshore oil concession. See Note 32 for further information.

Treasury shares^a 

			2018				2017				2016
	Shares thousand		Nominal value $ million		Shares thousand		Nominal value $ million		Shares thousand		Nominal value $ million
At 1 January	1,482,072		370		1,614,657		403		1,756,327		439
Purchases for settlement of employee share plans	757		—		4,423		1		9,631		2
Issue of new shares for employee share-based payment plans	92,168		23		—		—		—		—
Shares re-issued for employee share-based payment plans	(148,732	)	(37	)	(137,008	)	(34	)	(151,301	)	(38	)
At 31 December	1,426,265		356		1,482,072		370		1,614,657		403
Of which – shares held in treasury by BP	1,264,732		316		1,472,343		368		1,576,411		394
– shares held in ESOP trusts	161,518		40		9,705		2		21,432		5
– shares held by BP’s US share plan administratorb	15		—		24		—		16,814		4

^a  See Note 32 for definition of treasury shares.

^b  Held in the form of ADSs to meet the requirements of employee share-based payment plans in the US.