Consolidated net debt (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Consolidated Net Debt [Abstract]

Analysis of changes in consolidated net debt

	Financing liabilities ^(b)						Other assets
	Borrowings (including finance leases) excluding			Debt-related derivatives (included in Other financial assets/			Cash/			Other			2017			2016
	Overdrafts ^(a)			liabilities)			Overdrafts ^(b)			investments ^(c)		Net debt			Net debt
Year ended 31 December												US$m			US$m
Analysis of changes in consolidated net debt
Opening balance		(17,618	)		(408	)		8,189			250		(9,587	)		(13,783	)
Foreign exchange adjustment		(303	)		245			(12	)		-		(70	)		90
Cash movements excluding exchange movements		2,777			7			2,370			705		5,859			3,915
Other non-cash movements		(29	)		(21	)		-			3		(47	)		191
Closing balance		(15,173	)		(177	)		10,547			958		(3,845	)		(9,587	)

(a)

Borrowings (including finance leases) at 31 December 2017 differ from total borrowings on the balance sheet as they exclude overdrafts of US$3 million (31 December 2016: US$12 million), other current financial liabilities of US$352 million (31 December 2016: US$205 million) and other non-current financial liabilities US$524 million (31 December 2016: US$557 million).

(b)	Closing cash/overdrafts at 31 December 2017 differ from cash and cash equivalents on the balance sheet as they include overdrafts of US$3 million which have been classified as a financial liability (31 December 2016: US$12 million).

(c)	Other investments comprise US$958 million (2016: US$250 million) of highly liquid financial assets held in managed investment funds classified as held for trading.

Exchange gains/(losses) on US dollar net debt and intragroup balances

		2017			2016		2015
	US$m			US$m		US$m
Exchange gains/(losses) on US dollar net debt and intragroup balances
Exchange gains/(losses) on US dollar net debt		554			160		(1,578	)
Exchange (losses)/gains on intragroup balances		(1,154	)		449		(1,961	)
Exchange (losses)/gains on settlement of dividends		(1	)		2		1
(Charged)/credited to income statement		(601	)		611		(3,538	)