Called-up share capital (Tables)

12 Months Ended

Dec. 31, 2017

Share Capital, Reserves And Other Equity Interest [Abstract]

Disclosure of classes of share capital

Treasury shares^a 

			2017				2016				2015
	Shares thousand		Nominal value $ million		Shares thousand		Nominal value $ million		Shares thousand		Nominal value $ million
At 1 January	1,614,657		403		1,756,327		439		1,811,297		453
Purchases for settlement of employee share plans	4,423		1		9,631		2		51,142		13
Shares re-issued for employee share-based payment plansb	(137,008	)	(34	)	(151,301	)	(38	)	(106,112	)	(27	)
At 31 December	1,482,072		370		1,614,657		403		1,756,327		439
Of which – shares held in treasury by BP	1,472,343		368		1,576,411		394		1,727,763		432
– shares held in ESOP trusts	9,705		2		21,432		5		18,453		4
– shares held by BP’s US share plan administratorc	24		—		16,814		4		10,111		3

^a  See Note 30 for definition of treasury shares.

^b A minor amendment has been made to the number of shares re-issued for employee share-based payment plans in 2016.

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

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

			2017			2016		2015
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	21,049,696		5,263		20,108,771	5,028	20,005,961	5,002
Issue of new shares for the scrip dividend programme	289,789		72		548,005	137	102,810	26
Issue of new shares – otherb	—		—		392,920	98	—	—
Repurchase of ordinary share capital	(51,292	)	(13	)	—	—	—	—
At 31 December	21,288,193		5,322		21,049,696	5,263	20,108,771	5,028
			5,343			5,284		5,049

^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  Relates to the issue of new ordinary shares in consideration for a 10% interest in the Abu Dhabi onshore oil concession. See Note 30 for further information.