In a chaotic conclusion to the Congressional year, the Senate blocked an effort on Wednesday to open the Arctic National Wildlife Refuge to oil drilling and struck a last-minute accord to extend the antiterrorism law known as the USA Patriot Act for six months.

With Vice President Dick Cheney casting the decisive vote, the Senate also approved a $40 billion budget-cutting plan. And the Senate sent to President Bush a Pentagon policy measure with a ban on torturing detainees linked to terrorism.