Free cash flow is defined as net cash from operating activities minus net cash from (used in) investing activities, excluding payment for purchases (proceeds from the sale of) marketable securities and short-term deposits, restricted cash and net cash variation for joint ventures deconsolidation. We believe free cash flow provides useful information for investors and management because it measures our capacity to generate cash from our operating and investing activities to sustain our operating activities. Free cash flow is not a U.S. GAAP measure and does not represent total cash flow since it does not include the cash flows generated by or used in financing activities. In addition, our definition of free cash flow may differ from definitions used by other companies.

Free cash flow (in US$ millions)	Q4 2016		Q3 2016		Q2 2016		Q1 2016		FY 2016		Q4 2015		Q3 2015		Q2 2015		Q1 2015		FY 2015
Net cash from operating activities	378		330		191		141		1,039		245		225		223		149		842
Net cash used in investing activities	(243	)	(230	)	(144	)	(110	)	(727	)	(98	)	(120	)	(190	)	(108	)	(516	)
Payment for purchase and proceeds from sale of marketable securities, investment in short-term deposits, restricted cash and net cash variation for joint ventures deconsolidation	-		-		-		-		-		1		(20	)	20		-		1
Free cash flow - Non-U.S. GAAP	135		100		47		31		312		148		85		53		41		327

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