. cash used for these working capital components increased by $ 354 million in 2006 , compared with a $ 558 million increase in 2005 and a $ 117 million increase in 2004 . the increase in 2006 was principally due to decreases in accounts payable and accrued liabilities . investment activities investment activities in 2006 included $ 1.8 billion of net cash proceeds received from divestitures , $ 1.6 billion of net cash proceeds received from the sale of u.s