NVL function issue

Hello All,
I have a strange problem with a NVL function. In one of the view I am using a NVL fuction like this "NVL(doc_id,'-1') doc_id' and when I am
querying the view based on the doc_id it is taking more time because of the this NVL function.I removed the same and tested it is coming out withing milli secs.
Is there any way or any other function I can use.one more thing DOC_ID in the table is a VARCHAR2 field.
Please help me with this.
Best regards,
Pavan Patil

Tried Case not working ......
Please find the query (Table names and joines mentioned are not proper ones) ---
SELECT DECODE (tdoc.case_ver_no,
-1, -1,
c.uwrt_case_tid
) case_tid,
c.case_id case_id, c.case_ver_no case_version_no,
c.prft_cntr_sid profit_cntr,
c.jnt_life_qualf_cd joint_life, c.co_id co_id,
(SELECT co_lnm
FROM t
WHERE cd = c.cd) co_lnm,
ald.given_nm first_name, ald.mid_nm middle_name,
ald.family_nm last_name, ald.life_idx_id life_id,
ald.sex_cd gender, al.doc_handle_id doc_handle_id,
alb.bnft_cd benefit_type,
alb.propsl_si_amt propsl_fc_amt, c.crncy_cd crncy_cd,
c.indiv_grp_cd individual_group_code,
c.assmnt_typ_cd assessment_type,
c.cli_ref_id client_ref,
DECODE (TO_CHAR (tdoc.case_ver_no),
'-1', '-1',
c.uwrt_id
) underwriter_id,
c.bu_cd bu_cd, al.assmnt_age_offset age,
(SELECT alb.bnft_cd rider_type
FROM te al,
tt alb,
tuwrt_case c
WHERE alb.main_bnft_ind <> 1
AND al.atid = alb.atid
AND al.utid = c.utid
AND c.case_id = c.case_id
AND ROWNUM = 1) rider_type,
(SELECT stat_cd
FROM tat
WHERE uwrt_case_tid = c.uwrt_case_tid
AND seq_no =
(SELECT MAX (ucs1.seq_no)
FROM tat ucs1
WHERE ucs1.uwrt_case_tid = c.uwrt_case_tid))
status,
NVL(tdoc.doc_id,'-1') doc_id, tdoc.doc_ttl doc_ttl,
tdoc.doc_typ_cd doc_typ_cd,
tdoc.bof_doc_catg_cd bof_doc_catg,
tdoc.doc_prim_catg_cd doc_prim_catg,
tdoc.doc_lang_cd doc_lang_cd, tdoc.doc_nm doc_nm,
tdoc.doc_crte_meth_cd doc_crte_meth_cd,
tdoc.doc_del_stat_cd doc_del_stat_cd,
tdoc.doc_fmt doc_fmt,
tdoc.doc_lock_user_id doc_lock_user_id,
tdoc.doc_lock_ts doc_lock_ts, tdoc.doc_ver doc_ver,
tdoc.doc_size doc_size,
tdoc.doc_ind_stat_cd doc_ind_stat_cd,
tdoc.doc_ind_user_id doc_ind_user_id,
DECODE (tdoc.doc_ind_loc_cd,
'CA', 'CAN',
'CARB', 'CAN',
tdoc.doc_ind_loc_cd
) doc_ind_loc_cd,
tdoc.last_upd_user_id last_upd_user_id, tdoc.upd_ts,
TO_DATE
(TO_CHAR (TO_DATE (tdoc.doc_recv_dt,
'yyyymmddhh24miss'
'MM/DD/YYYY HH24:MI:SS'
'MM/DD/YYYY HH24:MI:SS'
) doc_recv_dt,
TO_DATE
(TO_CHAR (TO_DATE (tdoc.doc_attch_dt,
'yyyymmddhh24miss'
'MM/DD/YYYY HH24:MI:SS'
'MM/DD/YYYY HH24:MI:SS'
) doc_attch_dt
FROM tt c,
ttl,
ttd,
ttft alb,
ttoc tdoc
WHERE al.u_tid(+) = c.u_tid
AND ald.a_tid(+) = al.a_tid
AND alb.astid(+) = al.astid
AND tdoc.doc_handle_id(+) = al.doc_handle_id
AND alb.main_ind(+) = 1
AND NVL (tdoc.doc_del_stat_cd, 'XX') != 'DELETD'

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{message:id=9360003}

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