Lease commitments (Tables)

12 Months Ended

Dec. 31, 2018

Leases1 [Abstract]

Disclosure of Lease Receivables

	2018				2017
	Total future minimum payments	Unearned finance income		Present value	Total future minimum payments	Unearned finance income		Present value
	$m	$m		$m	$m	$m		$m
Lease receivables:
No later than one year	2,229	(196	)	2,033	3,523	(326	)	3,197
Later than one year and no later than five years	7,420	(628	)	6,792	7,033	(696	)	6,337
Later than five years	5,032	(619	)	4,413	4,784	(669	)	4,115
At 31 Dec	14,681	(1,443	)	13,238	15,340	(1,691	)	13,649