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FAIR VALUE MEASUREMENTS, INCLUDING DERIVATIVES (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
Financial instruments for which the carrying amount may not equal estimated fair value at June 30, 2012 and December 31, 2011 were as follows:
 
 
June 30, 2012
 
December 31, 2011
Millions of dollars
 
Carrying
Amount
 
Estimated
Fair Value
 
Carrying
Amount
 
Estimated
Fair Value
Long-term debt
 
$
4,883.6

 
$
5,835.0

 
$
4,653.0

 
$
5,479.2

Fair Value, Measurement Inputs, Disclosure [Table Text Block]
The Company values available for sale securities using quoted prices from a national stock exchange, such as the NASDAQ, where the securities are actively traded.  For commodity derivative and energy management assets and liabilities, the Company uses unadjusted NYMEX prices to determine fair value, and considers such measures of fair value to be Level 1 for exchange traded instruments and Level 2 for over-the-counter instruments.  The Company’s interest rate swap agreements are valued using discounted cash flow models with independently sourced market data.  Fair value measurements, and the level within the fair value hierarchy in which the measurements fall, were as follows:
 
 
 
 
Fair Value Measurements Using
 
 
 
 
Quoted Prices in Active
 
Significant Other
 
 
 
 
Markets for Identical Assets
 
Observable Inputs
Millions of dollars
 
(Level 1)
 
(Level 2)
As of June 30, 2012
 
 

 
 
Assets -
 
Available for sale securities
 
$
8

 

 
 
Interest rate contracts
 

 
$
28

 
 
Commodity contracts
 
1

 
2

 
 
Energy management contracts
 

 
21

Liabilities -
 
Interest rate contracts
 

 
120

 
 
Commodity contracts
 
1

 
6

 
 
Energy management contracts
 
1

 
22

As of December 31, 2011
 
 

 
 

Assets -
 
Available for sale securities
 
$
3

 

 
 
Interest rate contracts
 

 
$
2

 
 
Commodity contracts
 

 
1

 
 
Energy management contracts
 

 
27

Liabilities -
 
Interest rate contracts
 

 
158

 
 
Commodity contracts
 
1

 
13

 
 
Energy management contracts
 

 
26

SCE&G
 
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair Value, Measurement Inputs, Disclosure [Table Text Block]
Consolidated SCE&G’s interest rate swap agreements are valued using discounted cashflow models with independently sourced market data.  Fair value measurements based on significant other observable inputs (level 2) were as follows: 
 
 
Fair Value Measurements Using
 
 
Significant Other
 
 
Observable Inputs (Level 2)
Millions of dollars
 
June 30, 2012
 
December 31, 2011

 
 
 
 
 
Assets -
 
Interest rate contracts
 
$28
 
$1
Liabilities-
 
Interest rate contracts
 
87
 
77