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Shareholder Report
 6 Months Ended
Oct. 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Columbia Funds Series Trust I
Entity Central Index Key 0000773757
Entity Investment Company Type N-1A
Document Period End Date Oct. 31, 2024
 Columbia Bond Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Columbia Bond Fund
Class Name Class A
Trading Symbol CNDAX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Bond Fund (the Fund) for the period of May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class A
$
38		0.74
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.74% [1]
Net Assets $ 920,550,564
Holdings Count | Holding 398
Investment Company, Portfolio Turnover 121.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
920,550,564
Total number of portfolio holdings398
Portfolio turnover for the reporting period121%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities24%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment
makeup
of the
Fund
represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are
subject
to change, including
daily
.
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are
subject
to change, including
daily
.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
Columbia Bond Fund - Advisor Class  
Shareholder Report [Line Items]  
Fund Name Columbia Bond Fund
Class Name Advisor Class
Trading Symbol CNDRX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Bond Fund (the Fund) for the period of May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
Class Cost of a $10,000 investment Cost paid as a percentage of a $10,000 investment
Advisor Class
$
25		 0.49
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.49% [1]
Net Assets $ 920,550,564
Holdings Count | Holding 398
Investment Company, Portfolio Turnover 121.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
920,550,564
Total number of portfolio holdings 398
Portfolio turnover for the reporting period 121%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities 24%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment
makeup
of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The
Fund's
portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change,
including
daily.
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		 3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		 3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		 3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		 1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		 1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		 1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		 1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		 1.3
%
RR 1 LLC
07/15/2035 6.518%		 1.1
%
AbbVie, Inc.
03/15/2029 4.800%		 1.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change,
including
daily.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		 3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		 3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		 3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		 1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		 1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		 1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		 1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		 1.3
%
RR 1 LLC
07/15/2035 6.518%		 1.1
%
AbbVie, Inc.
03/15/2029 4.800%		 1.1
%
Columbia Bond Fund - Institutional Class  
Shareholder Report [Line Items]  
Fund Name Columbia Bond Fund
Class Name Institutional Class
Trading Symbol UMMGX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Bond Fund (the Fund) for the period of May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting
period
?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional Class
$
26		0.50
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.50% [1]
Net Assets $ 920,550,564
Holdings Count | Holding 398
Investment Company, Portfolio Turnover 121.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
920,550,564
Total number of portfolio holdings398
Portfolio turnover for the reporting period121%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities24%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a
percentage
of Fund
net
assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the
same
methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the
same
methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
Columbia Bond Fund - Institutional 2 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Bond Fund
Class Name Institutional 2 Class
Trading Symbol CNFRX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Bond Fund (the Fund) for the period of May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 in
vestm
ent
Institutional 2 Class
$
23		0.44
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.44% [1]
Net Assets $ 920,550,564
Holdings Count | Holding 398
Investment Company, Portfolio Turnover 121.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
920,550,564
Total number of portfolio holdings398
Portfolio turnover for the reporting period121%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities24%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net
assets
. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
Columbia Bond Fund - Institutional 3 Class  
Shareholder Report [Line Items]  
Fund Name Columbia Bond Fund
Class Name Institutional 3 Class
Trading Symbol CBFYX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Bond Fund (the Fund) for the period of May 1, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more
information
by contacting us at
1-800-345-6611.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Institutional 3 Class
$
21		0.40
%
(a)
(a)
Annualized.
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.40% [1]
Net Assets $ 920,550,564
Holdings Count | Holding 398
Investment Company, Portfolio Turnover 121.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
920,550,564
Total number of portfolio holdings398
Portfolio turnover for the reporting period121%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities24%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets. Derivatives are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are
subject
to change, including daily.
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are
subject
to change, including daily.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
Columbia Bond Fund - Class S  
Shareholder Report [Line Items]  
Fund Name Columbia Bond Fund
Class Name Class S
Trading Symbol UMMDX
Annual or Semi-Annual Statement [Text Block] This
semiannual shareholder report
contains important information about Columbia Bond Fund (the Fund) for the period of October 2, 2024 to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
columbiathreadneedleus.com/resources/literature
. You can also request more information by contacting us at
1-800-345-6611.
Additional Information Phone Number 1-800-345-6611
Additional Information Website columbiathreadneedleus.com/resources/literature
Expenses [Text Block]
What were the Fund costs for the reporting period?
(Based on a hypothetical $10,000 investment)
ClassCost of a $10,000 investmentCost paid as a percentage of a $10,000 investment
Class S
$
4
(a)
0.51
%
(b)
(a)
Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.
(b)
Annualized.
Expenses Paid, Amount $ 4 [2]
Expense Ratio, Percent 0.51% [1]
Net Assets $ 920,550,564
Holdings Count | Holding 398
Investment Company, Portfolio Turnover 121.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Fund net assets
$
920,550,564
Total number of portfolio holdings398
Portfolio turnover for the reporting period121%
Portfolio turnover for the reporting period excluding to be announced (TBA) securities24%
Holdings [Text Block]
Graphical Representation of Fund
 
Holdings
The tables below show the investment makeup of the Fund represented as a percentage of Fund net assets.
Derivatives
are excluded from the tables unless otherwise noted. The Fund's portfolio composition is subject to change.
Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
Asset Categories
Graphical Representation - Allocation 1 Chart
Credit Quality
Graphical Representation - Allocation 2 Chart
Credit Quality Explanation [Text Block] Bond ratings on Fund holdings are divided into categories ranging from highest to lowest credit quality, determined by using the middle rating of Moody’s Ratings, S&P and Fitch, after dropping the highest and lowest available ratings. When ratings are available from only two rating agencies, the lower rating is used. When a rating is available from only one rating agency, that rating is used. If a security is not rated by Moody's Ratings, S&P or Fitch, but has a rating by Kroll and/or DBRS, the same methodology is applied to those bonds that would otherwise be not rated. When a bond is not rated by any rating agency, it is designated as “Not rated.” Credit quality ratings assigned by a rating agency are subjective opinions, not statements of fact, and are subject to change, including daily.
Largest Holdings [Text Block]
Top Holdings
Uniform Mortgage-Backed Security TBA
11/14/2054 3.000%		3.6
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.000%		3.2
%
Uniform Mortgage-Backed Security TBA
11/14/2054 6.000%		3.0
%
Uniform Mortgage-Backed Security TBA
11/14/2054 4.500%		1.8
%
Federal National Mortgage Association
08/01/2052 4.000%		1.8
%
Federal National Mortgage Association
09/01/2053 5.000%		1.4
%
Federal Home Loan Mortgage Corp.
09/01/2051 2.500%		1.3
%
Federal Home Loan Mortgage Corp.
08/01/2052 4.000%		1.3
%
RR 1 LLC
07/15/2035 6.518%		1.1
%
AbbVie, Inc.
03/15/2029 4.800%		1.1
%
[1] Annualized.
[2] Based on operations from October 2, 2024 (commencement of operations) through the stated period end. Had the class been open for the entire reporting period, expenses shown in the table above would have been higher.