West Texas Intermediate oil declined on Monday together with Brent crude after the global powers and Iran reached a deal on the country's nuclear programme cutting Iranian sales of oil by 60% since the beginning of 2012. WTI for settlement in January slipped $1.45 to $93.39 a barrel on the NYMEX, while the discount to Brent shrank to $14.70 today from $16.21 on November 22.