Employee Benefit Plans (Target and Actual Asset Allocations) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Master Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	100.00%	100.00%
Target allocation	100.00%
Master Trust [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation		100.00%
Master Trust [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	10.00%	28.00%
Target allocation	10.00%
Master Trust [Member] | US Equity Securities [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation		20.00%
Master Trust [Member] | Non US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	8.00%	15.00%
Target allocation	8.00%
Master Trust [Member] | Non US Equity Securities [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation		14.00%
Master Trust [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	10.00%	10.00%
Target allocation	10.00%
Master Trust [Member] | Equity Securities [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation		8.00%
Master Trust [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	63.00%	32.00%
Target allocation	63.00%
Master Trust [Member] | Debt Securities [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation		35.00%
Master Trust [Member] | Global Private Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	3.00%	3.00%
Target allocation	3.00%
Master Trust [Member] | Global Private Equity Securities [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation		10.00%
Master Trust [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	3.00%	4.00%
Target allocation	2.00%
Master Trust [Member] | Hedge Funds [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation		9.00%
Master Trust [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	1.00%	4.00%
Target allocation	2.00%
Master Trust [Member] | Real Estate [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation		1.00%
Master Trust [Member] | Other Global Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	2.00%	4.00%
Target allocation	2.00%
Master Trust [Member] | Other Global Securities [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation		3.00%
Veba I [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	100.00%	100.00%
Target allocation	100.00%
Veba I [Member] | US Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	29.00%	23.00%
Target allocation	30.00%
Veba I [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	42.00%	45.00%
Target allocation	25.00%
Veba I [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocation	29.00%	32.00%
Target allocation	45.00%