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Risk/Return: rr_RiskReturnAbstract  
Supplement Text Block oficorebnd-20141020_SupplementTextBlock
  
OPPENHEIMER CORE BOND FUND
Supplement dated October 20, 2014 to the
Prospectus dated March 28, 2014
 
  
This supplement amends the Prospectus of Oppenheimer Core Bond Fund (the "Fund"), dated March 28, 2014, and is in addition to any other supplement(s).
Effective immediately:
1.
The tables titled "Shareholder Fees" and "Annual Fund Operating Expenses," and the footnotes that immediately follow those tables, on page 3 of the Prospectus, have been deleted in their entirety and replaced with the following:
Shareholder Fees (fees paid directly from your investment)
 
Class A
Class B
Class C
Class R
Class Y
Class I
Maximum Sales Charge (Load) imposed on purchases (as a % of offering price)
4.75%
None
None
None
None
None
Maximum Deferred Sales Charge (Load) (as a % of the lower of original offering price or redemption proceeds)
None
5%
1%
None
None
None

Annual Fund Operating Expenses1 (expenses that you pay each year as a percentage of the value of your investment)
 
Class A
Class B
Class C
Class R
Class Y
Class I
Management Fees
0.49%
0.49%
0.49%
0.49%
0.49%
0.49%
Distribution and/or Service (12b-1) Fees
0.25%
1.00%
1.00%
0.50%
None
None
Other Expenses
0.24%
0.24%
0.24%
0.24%
0.24%
0.05%
Acquired Fund Fees and Expenses
0.01%
0.01%
0.01%
0.01%
0.01%
0.01%
Total Annual Fund Operating Expenses
0.99%
1.74%
1.74%
1.24%
0.74%
0.55%
      Fee Waiver and/or Expense Reimbursement2
(0.14%)
(0.08%)
(0.08%)
(0.08%)
(0.14%)
(0.02%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement
0.85%
1.66%
1.66%
1.16%
0.60%
0.53%
 
1.
Expenses have been restated to reflect current fees.
2.
After discussions with the Fund's Board, the Manager has contractually agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit "Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement" to annual rates of 0.85% for Class A and 0.60% for Class Y shares, as calculated on the daily net assets of the Fund. In addition, the Manager has contractually agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit "Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement" (excluding any applicable interest and fees from borrowing, interest and related expenses from inverse floaters, dividend expense, taxes, any subsidiary expenses, Acquired Fund Fees and Expenses, brokerage commissions, extraordinary expenses and certain other Fund expenses) to annual rates of 1.65% for Class B and Class C shares, and 1.15% for Class R shares, as calculated on the daily net assets of the Fund. After discussions with the Fund's Board, the Manager has contractually agreed to waive fees and/or reimburse Fund expenses in an amount equal to the indirect management fees incurred through the Fund's investments in funds managed by the Manager or its affiliates. Each of these fee waivers and/or expense reimbursements may not be amended or withdrawn for one year from the date of this prospectus supplement, unless approved by the Board.
   
2.
The table under the section titled "Example," on page 3 of the Prospectus, has been deleted in its entirety and replaced with the following: 
If shares are redeemed:
If shares are not redeemed:
 
1 Year
3 Years
5 Years
10 Years
1 Year
3 Years
5 Years
10 Years
Class A
$558
$763
$986
$1,624
$558
$763
$986
$1,624
Class B
$670
$845
$1,144
$1,677
$170
$545
$944
$1,677
Class C
$270
$545
$944
$2,063
$170
$545
$944
$2,063
Class R
$119
$388
$677
$1,502
$119
$388
$677
$1,502
Class Y
$62
$223
$399
$909
$62
$223
$399
$909
Class  I
$54
$175
$306
$689
$54
$175
$306
$689
 
 
(Oppenheimer Core Bond Fund)
  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

 [1]
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Expenses have been restated to reflect current fees.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption

If shares are redeemed:

Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption

If shares are not redeemed:

(Oppenheimer Core Bond Fund) | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum Deferred Sales Charge (Load) (as a % of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.49%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.99%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.14%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 558
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 763
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 986
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,624
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 558
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 763
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 986
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,624
(Oppenheimer Core Bond Fund) | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a % of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 5.00%
Management Fees rr_ManagementFeesOverAssets 0.49%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.74%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.66%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 670
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,144
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,677
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 170
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 545
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 944
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,677
(Oppenheimer Core Bond Fund) | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a % of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees rr_ManagementFeesOverAssets 0.49%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.74%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.66%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 270
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 545
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 944
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,063
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 170
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 545
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 944
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,063
(Oppenheimer Core Bond Fund) | Class R
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a % of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.49%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.24%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 119
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 388
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 677
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,502
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 119
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 388
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 677
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,502
(Oppenheimer Core Bond Fund) | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a % of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.49%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.74%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.14%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.60%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 223
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 399
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 909
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 62
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 223
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 399
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 909
(Oppenheimer Core Bond Fund) | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a % of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.49%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.05%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.55%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 175
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 306
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 689
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 54
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 175
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 306
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 689
[1] Expenses have been restated to reflect current fees.
[2] After discussions with the Fund's Board, the Manager has contractually agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit "Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement" to annual rates of 0.85% for Class A and 0.60% for Class Y shares, as calculated on the daily net assets of the Fund. In addition, the Manager has contractually agreed to waive fees and/or reimburse the Fund for certain expenses in order to limit "Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement" (excluding any applicable interest and fees from borrowing, interest and related expenses from inverse floaters, dividend expense, taxes, any subsidiary expenses, Acquired Fund Fees and Expenses, brokerage commissions, extraordinary expenses and certain other Fund expenses) to annual rates of 1.65% for Class B and Class C shares, and 1.15% for Class R shares, as calculated on the daily net assets of the Fund. After discussions with the Fund's Board, the Manager has contractually agreed to waive fees and/or reimburse Fund expenses in an amount equal to the indirect management fees incurred through the Fund's investments in funds managed by the Manager or its affiliates. Each of these fee waivers and/or expense reimbursements may not be amended or withdrawn for one year from the date of this prospectus supplement, unless approved by the Board.