Visual Studio 2008 full installation had always included Business Intelligence Development Studio (BIDS) with it. But for whatever reasons MSFT decided to skip that part in VS 2010(may be because there was no major release SQL Server during that time) and it was missing for very long time till release of next major SQL Server release aka.. SQL Server 2012. Even at that point there was no BIDS or similar tool set available in VS 2010/12 till MSFT released SQL Server Data Tools BI Studio for VS 2012.
So after I got VS 2013 edition installed on my system I was trying to install SSDT BI for VS 2013 so I can play with it on my new VS. But to my surprise, when I started installation it failed on a step where it check for pre-requisites with error about having different architecture which is understandable since I am using x64 bit system. So I looked for 64bit installation for SSDT BI and found that there is no such installation !!