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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

Changes in value of marketable securities reported in current and non-current assets on consolidated balance sheets


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


In millions of U.S. dollars		December 31, 2009				Purchase				Other increase				Sale				Other decrease				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, 2010
Debt securities issued by the U.S. Treasury			340				690				—				(680	)			—				—				—				—				350
Debt securities issued by foreign governments			144				410				—				(331	)			—				—				—				(10	)			213
Senior debt Floating Rate Notes issued by financial institutions			548				—				—				(208	)			—				4				(3	)			(13	)			328
Auction Rate Securities			42				—				—				—				—				30				—				—				72
Equity securities classified as held-for-trading			—				—				20				—				(22	)			—				2				—				—
Equity securities classified as available-for-sale			—				—				583				(375	)			—				(14	)			(33	)			—				161

Total			1,074				1,100				603				(1,594	)			(22	)			20				(34	)			(23	)			1,124

*	Other Comprehensive Income