The Phoenix, Arizona-based mining and oil and gas company reported a net loss of $2.9 billion for the fourth quarter and $1.3 billion for the year.
The results compare with net income of $707 million for the fourth quarter of 2013 and $2.7 billion for 2013 as a whole.
The company said that it recognised ceiling test impairment charges of $3.7 billion on its oil and gas properties including $3.4
