v3.26.1
Shareholder Report
 6 Months Ended
Apr. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name American Beacon Institutional Funds Trust
Entity Central Index Key 0001700933
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000186839  
Shareholder Report [Line Items]  
Fund Name Diversified Fund
Class Name AAL
Trading Symbol ZABDFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about American Beacon Diversified Fund for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can request this information by contacting us at 800-658-5811.
Additional Information Phone Number 800-658-5811
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
AAL
$21
0.42%Footnote Reference*
Footnote Description
Footnote*
 Annualized.
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.42% [1]
AssetsNet $ 597,129,616
Holdings Count | Holding 535
Advisory Fees Paid, Amount $ 975,643
InvestmentCompanyPortfolioTurnover 45.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Table Summary
Total Net Assets
$597,129,616
# of Portfolio Holdings
535
Portfolio Turnover Rate
45%
Total Management Fees Paid
$975,643
Holdings [Text Block]

Top Ten Country Exposure - % Investments

Group By Country Chart
Table Summary
Value
Value
Netherlands
1.2
Republic of Korea
1.2
China
1.2
Taiwan
1.4
Canada
1.9
France
2.0
Japan
2.5
Germany
2.6
United Kingdom
3.9
United States
77.9

Excludes cash equivalents.

Sector Allocation - % Equities

Group By Industry Chart
Table Summary
Value
Value
Real Estate
1.1
Utilities
5.1
Consumer Staples
5.1
Communication Services
5.8
Materials
6.8
Energy
6.8
Consumer Discretionary
7.2
Health Care
10.6
Industrials
14.7
Information Technology
17.1
Financials
19.7

Top Ten Industry Allocations - % Fixed Income

Group By Sector Chart
Table Summary
Value
Value
Diversified Financial Services
0.8
Insurance
0.9
Pharmaceuticals
1.1
Telecommunications
1.6
Media
1.6
Banks
4.1
Electric
4.6
Asset-Backed Obligations
7.8
U.S. Agency Mortgage-Backed Obligations
32.3
U.S. Treasury Obligations
38.1

Asset Allocation - % Investments

Group By Asset Type Chart
Table Summary
Value
Value
Common Stocks
43.2
Foreign Common Stocks
18.9
U.S. Treasury Obligations
12.3
U.S. Agency Mortgage-Backed Obligations
10.4
Investment Companies
5.2
Corporate Obligations
4.7
Asset-Backed Obligations
2.5
Foreign Corporate Obligations
1.7
Securities Lending Collateral
0.3
Commercial Mortgage-Backed Obligations
0.3
Collateralized Mortgage Obligations
0.2
Foreign Sovereign Obligations
0.2
Foreign Preferred Stocks
0.1

The Fund may purchase and sell futures contracts to gain market exposure on cash balances.
Largest Holdings [Text Block]

 Top Ten Holdings - % Net Assets

Table Summary
U.S. Treasury Floating Rate Notes, 3.722%, Due 1/31/2028
2.8
U.S. Treasury Floating Rate Notes, 3.813%, Due 10/31/2027
2.8
U.S. Treasury Notes, 4.250%, Due 8/15/2035
1.9
U.S. Treasury Notes, 3.750%, Due 8/31/2026
1.8
U.S. Treasury Notes, 3.500%, Due 2/28/2031
1.1
Siemens Energy AG
0.9
Medtronic PLC
0.9
Microchip Technology, Inc.
0.9
U.S. Treasury Bonds, 4.750%, Due 8/15/2055
0.9
U.S. Treasury Inflation-Indexed Bonds, 2.375%, Due 2/15/2056
0.8

Excludes cash equivalents. 
Material Fund Change [Text Block]
Accountant Change Statement [Text Block]
[1] Annualized.