Average Annual Total Returns{- Franklin Total Return Fund} - Franklin Investors Securities Trust - FIST2-35 - Franklin Total Return Fund	Class A Return Before Taxes Past 1 year	Class A Return Before Taxes Past 5 years	Class A Return Before Taxes Past 10 years	Class A After Taxes on Distributions Past 1 year	Class A After Taxes on Distributions Past 5 years	Class A After Taxes on Distributions Past 10 years	Class A After Taxes on Distributions and Sales Past 1 year	Class A After Taxes on Distributions and Sales Past 5 years	Class A After Taxes on Distributions and Sales Past 10 years	Class C Return Before Taxes Past 1 year	Class C Return Before Taxes Past 5 years	Class C Return Before Taxes Past 10 years	Class R Return Before Taxes Past 1 year	Class R Return Before Taxes Past 5 years	Class R Return Before Taxes Past 10 years	Class R6 Return Before Taxes Past 1 year	Class R6 Return Before Taxes Past 5 years	Class R6 Return Before Taxes Since Inception		Advisor Class Return Before Taxes Past 1 year	Advisor Class Return Before Taxes Past 5 years	Advisor Class Return Before Taxes Past 10 years	Bloomberg Barclays U.S. Aggregate Index (index reflects no deduction for fees, expenses or taxes) Past 1 year	Bloomberg Barclays U.S. Aggregate Index (index reflects no deduction for fees, expenses or taxes) Past 5 years	Bloomberg Barclays U.S. Aggregate Index (index reflects no deduction for fees, expenses or taxes) Past 10 years
Total	3.18%	3.30%	3.34%	1.91%	2.17%	1.93%	1.86%	2.02%	1.96%	5.70%	3.69%	3.32%	6.94%	3.85%	3.47%	7.59%	4.49%	3.23%	[1]	7.37%	4.34%	3.98%	7.51%	4.43%	3.84%

[1] 1. Since inception May 1, 2013.