sum but not grouped by? - Mailing list pgsql-sql

I have the ff data:

id      |     date         |      hours
AAA    07-01-2005           3
AAA    07-02-2005           4
BBB    07-01-2005           6
BBB    07-02-2005           2
BBB    07-03-2005           7

Would it be possible to get the ff:

id      |     date         |      hours   |   id_total
AAA    07-01-2005           3              7
AAA    07-02-2005           4              7
BBB    07-01-2005           6              15
BBB    07-02-2005           2              15
BBB    07-03-2005           7              15

So it's like SUM OF, but not Grouped By? Is this possible at all?
Thank you for any help.