Changes in the value of marketable securities, as reported in current assets on the consolidated balance sheets as at December 31, 2012 and December 31, 2011 are detailed in the tables below:


In millions of U.S. dollars	December 31, 2011		Purchase		Sale/ Settlement			Change in fair value included in OCI* for available- for-sale marketable securities		Change in fair value recognized in earnings		Foreign exchange result through OCI*			December 31, 2012
Debt securities issued by the U.S. Treasury		100		450		(400	)		—		—		—			150
Debt securities issued by foreign governments		81		—		(81	)		—		—		—			—
Fixed rate debt securities issued by financial institutions		27		—		(25	)		—		—		(2	)		—
Senior debt Floating Rate Notes issued by financial institutions		205		—		(124	)		6		1		—			88
Total		413		450		(630	)		6		1		(2	)		238

*	Other Comprehensive Income


In millions of U.S. dollars	December 31, 2010		Purchase		Sale/ Settlement			Change in fair value included in OCI* for available- for-sale marketable securities			Change in fair value recognized in earnings			Realized gain		Foreign exchange result through OCI*			December 31, 2011
Debt securities issued by the U.S. Treasury		350		100		(350	)		—			—			—		—			100
Debt securities issued by foreign governments		213		225		(355	)		—			—			—		(2	)		81
Fixed rate debt securities issued by financial institutions		—		27		—			—			—			—		—			27
Senior debt Floating Rate Notes issued by financial institutions		328		—		(113	)		(2	)		(5	)		—		(3	)		205
Auction Rate Securities		72		—		(350	)		(45	)		—			323		—			—
Equity securities classified as available-for-sale		161		—		(189	)		14			14			—		—			—
Total		1,124		352		(1,357	)		(33	)		9			323		(5	)		413

*	Other Comprehensive Income