Average Annual Total Returns{- Franklin Growth Fund} - Franklin Custodian Funds-31 - Franklin Growth 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	S&P 500 Index (index reflects no deduction for fees, expenses or taxes) Past 1 year	S&P 500 Index (index reflects no deduction for fees, expenses or taxes) Past 5 years	S&P 500 Index (index reflects no deduction for fees, expenses or taxes) Past 10 years
Total	23.45%	16.73%	14.15%	21.21%	15.56%	13.44%	15.38%	13.31%	11.78%	28.67%	17.18%	13.94%	30.31%	17.77%	14.51%	31.08%	18.50%	16.97%	[1]	30.96%	18.36%	15.09%	18.40%	15.21%	13.88%

[1] 1. Since inception May 1, 2013.