COPENHAGEN - A.P. Moller-Maersk , the global oil and shipping conglomerate, said on Wednesday it has kept its expectation of an underlying profit of $4 billion for this year compared to $4.5 billion in 2014. In a briefing to investors which will be followed by presentations from its various business units, Maersk reiterated its cash flow for this year will amount to $8 billion from an earlier expected $9 billion.