The Houston-based player did, however, exit the year on a strong production footing, driven by output in the Denver-Jules basin and Marcellus shale.

Net profit for the year to the end of December was $978 million, down from $1.03 billion a year earlier.

Revenues, however, shot from $4.22 billion to $5.02 billion, but were eroded by higher operating expenses of $3.36 billion, up from $2.81