If you're applying for Credit Card in the same bank as your Savings Account - then Bank will just ask for Income Proof, check your Credit Score and sanction a Credit line basis these
However, If you're applying for Credit Card in a different Bank Account - then the Bank could ask for a lot of documentation (ITR, Account Statement, Salary Slip, Aadhar, etc) , but it's very unlikely that they will ask for your Credit Card Statement