(XLS:) Download

€ million		Dec. 31, 2014		Dec. 31, 2013
Trade receivables from
third parties		9,142		9,126
affiliated companies		230		266
joint ventures		2,037		1,712
associates		58		26
other investees and investors		4		3
		11,472		11,133

The fair values of the trade receivables correspond to the carrying amounts.

The trade receivables include receivables from construction contracts accounted for using the percentage of completion (PoC) method. These are calculated as follows:

(XLS:) Download

€ million		Dec. 31, 2014		Dec. 31, 2013
Contract costs and proportionate contract profit/ loss of construction contracts		1,327		1,575
of which billed to customers		−66		−49
Exchange rate effects		6		−3
PoC receivables, gross		1,267		1,523
Prepayments received		−1,065		−1,272
PoC receivables, net		202		251

Other payments received on account of construction contracts in the amount of €375 million (previous year: €350 million), for which no construction costs have yet been incurred, are recognized under other liabilities.