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Trade and other receivables (Tables)

12 Months Ended

Dec. 31, 2017

Trade And Other Receivables [Abstract]

Summary of trade and other receivables

	Non-current			Current			Total			Non-current			Current			Total
		2017			2017			2017			2016			2016			2016
	US$m			US$m			US$m			US$m			US$m			US$m
Trade receivables^(a)		1			2,314			2,315			-			2,283			2,283
Other receivables		526			820			1,346			347			880			1,227
Prepayment of tolling charges to jointly controlled entities^(b)		269			-			269			267			-			267
Pension surpluses (note 44)		871			-			871			625			-			625
Amounts due from equity accounted units		-			30			30			-			31			31
Other prepayments		57			279			336			103			266			369
		1,724			3,443			5,167			1,342			3,460			4,802

(a)	At 31 December 2017, trade and other receivables are stated net of provisions for doubtful debts of US$55 million (2016: US$66 million). Amounts of US$38 million were impaired during the year, and US$11 million of unused provision reversed.

(b)	These prepayments will be charged to Group operating costs as processing takes place.

Summary of ageing receivables

The ageing of these receivables is as follows:

						2017			2016
					US$m			US$m
less than 30 days overdue						122			196
between 30 and 60 days overdue						3			4
between 60 and 90 days overdue						17			7
more than 90 days overdue						3			23
						145			230