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Debt (Components Of Long-Term Debt) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2011
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2012
First Mortgage Bonds [Member]
Dec. 31, 2011
First Mortgage Bonds [Member]
Dec. 31, 2012
Medium-Term Notes [Member]
Dec. 31, 2011
Medium-Term Notes [Member]
Dec. 31, 2012
Unsecured Notes [Member]
Dec. 31, 2011
Unsecured Notes [Member]
Dec. 31, 2012
Transition Bonds [Member]
Dec. 31, 2011
Transition Bonds [Member]
Dec. 31, 2012
Delmarva Power & Light Co/De [Member]
Dec. 31, 2011
Delmarva Power & Light Co/De [Member]
Dec. 31, 2012
Delmarva Power & Light Co/De [Member]
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2011
Delmarva Power & Light Co/De [Member]
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2012
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2011
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2012
Delmarva Power & Light Co/De [Member]
Unsecured Notes [Member]
Dec. 31, 2011
Delmarva Power & Light Co/De [Member]
Unsecured Notes [Member]
Dec. 31, 2012
Atlantic City Electric Co [Member]
Dec. 31, 2011
Atlantic City Electric Co [Member]
Dec. 31, 2011
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2011
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2012
Potomac Electric Power Co [Member]
Dec. 31, 2011
Potomac Electric Power Co [Member]
Dec. 31, 2012
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
Pepco Energy Services [Member]
Dec. 31, 2011
Pepco Energy Services [Member]
Dec. 31, 2012
1.80% Due 2025 [Member]
Delmarva Power & Light Co/De [Member]
Dec. 31, 2012
1.80% Due 2025 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2011
1.80% Due 2025 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2012
0.75% - 4.90% Due 2026 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
0.75% - 4.90% Due 2026 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
0.75% - 4.90% Due 2026 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
2.30% Due 2028 [Member]
Delmarva Power & Light Co/De [Member]
Dec. 31, 2012
2.30% Due 2028 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2011
2.30% Due 2028 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2012
4.95% Due 2013 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
4.95% Due 2013 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
4.95% Due 2013 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
4.95% Due 2013 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
4.65% Due 2014 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
4.65% Due 2014 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
4.65% Due 2014 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
4.65% Due 2014 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
3.05% Due 2022 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
3.05% Due 2022 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
6.20% Due 2022 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
6.20% Due 2022 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
6.20% Due 2022 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
6.20% Due 2022 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.375% Due 2024 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.375% Due 2024 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.375% Due 2024 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.375% Due 2024 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.75% Due 2034 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.75% Due 2034 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.75% Due 2034 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.75% Due 2034 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.40% Due 2035 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.40% Due 2035 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.40% Due 2035 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.40% Due 2035 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
6.50% Due 2037 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
6.50% Due 2037 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
6.50% Due 2037 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
6.50% Due 2037 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
7.90% Due 2038 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
7.90% Due 2038 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
7.90% Due 2038 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
7.90% Due 2038 [Member]
Potomac Electric Power Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
6.63% Due 2013 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
6.63% Due 2013 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
7.63% Due 2014 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
7.63% Due 2014 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
7.68% Due 2015 - 2016 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
7.68% Due 2015 - 2016 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
7.75% Due 2018 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
7.75% Due 2018 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
6.80% Due 2021 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
6.80% Due 2021 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
4.35% Due 2021 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
4.35% Due 2021 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.60% Due 2025 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.60% Due 2025 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
4.875% Due 2029 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
4.875% Due 2029 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.80% Due 2034 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.80% Due 2034 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.80% Due 2036 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.80% Due 2036 [Member]
Atlantic City Electric Co [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
6.40% Due 2013 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
6.40% Due 2013 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.22% Due 2016 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.22% Due 2016 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.20% Due 2019 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2011
5.20% Due 2019 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
4.00% Due 2042 [Member]
Delmarva Power & Light Co/De [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
5.40% Due 2031 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2011
5.40% Due 2031 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Tax-Exempt Bonds [Member]
Dec. 31, 2012
7.56% - 7.58% Due 2017 [Member]
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2011
7.56% - 7.58% Due 2017 [Member]
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2012
6.81% Due 2018 [Member]
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2011
6.81% Due 2018 [Member]
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2012
7.61% Due 2019 [Member]
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2011
7.61% Due 2019 [Member]
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2012
7.72% Due 2027 [Member]
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2011
7.72% Due 2027 [Member]
Delmarva Power & Light Co/De [Member]
Medium-Term Notes [Member]
Dec. 31, 2012
5.00% Due 2014 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Notes [Member]
Dec. 31, 2011
5.00% Due 2014 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Notes [Member]
Dec. 31, 2012
5.00% Due 2015 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Notes [Member]
Dec. 31, 2011
5.00% Due 2015 [Member]
Delmarva Power & Light Co/De [Member]
Unsecured Notes [Member]
Dec. 31, 2012
4.46% Due 2016 [Member]
Transition Bonds [Member]
Dec. 31, 2012
4.46% Due 2016 [Member]
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2011
4.46% Due 2016 [Member]
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2012
4.91% Due 2017 [Member]
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2011
4.91% Due 2017 [Member]
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2012
5.05% Due 2020 [Member]
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2011
5.05% Due 2020 [Member]
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2012
5.55% Due 2023 [Member]
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2011
5.55% Due 2023 [Member]
Atlantic City Electric Co [Member]
Transition Bonds [Member]
Dec. 31, 2012
6.59% - 6.69% Due 2014 [Member]
Recourse Debt [Member]
Dec. 31, 2011
6.59% - 6.69% Due 2014 [Member]
Recourse Debt [Member]
Dec. 31, 2012
Five Point Nine Zero To Seven Point Four Six Percentage Due Two Thousand Thirteen To Two Thousand Eighteen [Member]
Pepco Energy Services [Member]
Secured Notes [Member]
Dec. 31, 2012
2.70% Due 2015 [Member]
Unsecured Notes [Member]
Dec. 31, 2011
2.70% Due 2015 [Member]
Unsecured Notes [Member]
Dec. 31, 2012
5.90% Due 2016 [Member]
Unsecured Notes [Member]
Dec. 31, 2011
5.90% Due 2016 [Member]
Unsecured Notes [Member]
Dec. 31, 2010
6.125% Due 2017 [Member]
Dec. 31, 2012
6.125% Due 2017 [Member]
Unsecured Notes [Member]
Dec. 31, 2011
6.125% Due 2017 [Member]
Unsecured Notes [Member]
Dec. 31, 2010
7.45% Due 2032 [Member]
Dec. 31, 2012
7.45% Due 2032 [Member]
Unsecured Notes [Member]
Dec. 31, 2011
7.45% Due 2032 [Member]
Unsecured Notes [Member]
Dec. 31, 2012
7.35% - 7.47% Due 2017 [Member]
Pepco Energy Services [Member]
Secured Notes [Member]
Dec. 31, 2011
7.35% - 7.47% Due 2017 [Member]
Pepco Energy Services [Member]
Secured Notes [Member]
Debt Instrument [Line Items]                                                                                                                                                                                                                                                                                        
Debt interest percentage         3.05%                       4.00%               4.35%         3.05%     1.80% 1.80% [1]         2.30% 2.30% [2]   4.95% [3],[4]   4.95% [5],[6]   4.65% [3],[4]   4.65% [5],[6]   3.05% 3.05% 6.20% [3],[4],[7]   6.20% [5],[6],[8]   5.375% [3]   5.375% [5]   5.75% [3],[4]   5.75% [5],[6]   5.40% [3],[4]   5.40% [5],[6]   6.50% [3],[4],[7]   6.50% [5],[6],[8]   7.90%   7.90%   6.63%   7.63%   7.68%   7.75%   6.80% [3],[9]   4.35%   5.60% [3],[9]   4.875% [10],[3],[4],[7],[9]   5.80% [10],[3],[4],[9]   5.80% [10],[3],[4],[9]   6.40%   5.22% [11],[3]   5.20% [11],[3]   4.00% 5.40%       6.81%   7.61%   7.72%   5.00%   5.00%   4.46% 4.46%   4.91%   5.05%   5.55%         2.70%   5.90%   6.125% 6.125%   7.45% 7.45%      
Debt instrument percentage, minimum                                                                       0.75% [11],[12],[3]   0.75%                                                                                                                                     7.56%                                         6.59%                         5.90%  
Debt instrument percentage, maximum                                                                       4.90% [12],[3]   4.90%                                                                                                                                     7.58%                                         6.69%                         7.46%  
Debt instrument maturity date                                                                   2025 [1]   2026 [11],[12],[3]       2028 [2]   2013 [3],[4]   2013 [5],[6]   2014 [3],[4]   2014 [5],[6]   2022 2022 2022 [3],[4],[7]   2022 [5],[6],[8]   2024 [3]   2024 [8]   2034 [3],[4]   2034 [5],[6]   2035 [3],[4]   2035 [5],[6]   2037 [3],[4],[7]   2037 [5],[6],[8]   2038   2038   2013   2014       2018   2021 [3],[9]   2021   2025 [3],[9]   2029 [10],[3],[4],[7],[9]   2034 [10],[3],[4],[9]   2036 [10],[3],[4],[9]   2013   2016 [11],[3]   2019 [11],[3]   2042 2031   2017   2018   2019   2027   2014   2015     2016   2017   2020   2023   2014     2015   2016   2017 2017   2032 2032      
Debt instrument maturity date, start                                                                                                                                                               2015                                                                                               2017                        
Debt instrument maturity date, end                                                                                                                                                               2016                                                                                               2024                        
Debt instrument, carrying value     $ 78 $ 109 $ 3,140 $ 2,798 $ 40 $ 40 $ 906 $ 906         $ 78 $ 109 $ 600 $ 416 $ 40 $ 40 $ 200 $ 200                         $ 15 [1]   $ 35 [11],[12],[3]       $ 16 [2] $ 200 [3],[4] $ 200 [3],[4] $ 200 [5],[6] $ 200 [5],[6] $ 175 [3],[4] $ 175 [3],[4] $ 175 [5],[6] $ 175 [5],[6] $ 200 $ 200 $ 110 [3],[4],[7] $ 110 [3],[4],[7] $ 110 [5],[6],[8] $ 110 [5],[6],[8]   $ 38 [3]   $ 38 [5] $ 100 [3],[4] $ 100 [3],[4] $ 100 [5],[6] $ 100 [5],[6] $ 175 [3],[4] $ 175 [3],[4] $ 175 [5],[6] $ 175 [5],[6] $ 500 [3],[4],[7] $ 500 [3],[4],[7] $ 500 [5],[6],[8] $ 500 [5],[6],[8] $ 250 $ 250 $ 250 $ 250 $ 69 $ 69 $ 7 $ 7 $ 17 $ 17 $ 250 $ 250 $ 39 [3],[9] $ 39 [3],[9] $ 200 $ 200   $ 4 [3],[9] $ 23 [10],[3],[4],[7],[9] $ 23 [10],[3],[4],[7],[9] $ 120 [10],[3],[4],[9] $ 120 [10],[3],[4],[9] $ 105 [10],[3],[4],[9] $ 105 [10],[3],[4],[9] $ 250 $ 250 $ 100 [11],[3] $ 100 [11],[3]   $ 31 [11],[3] $ 250 $ 78 $ 78 $ 14 $ 14 $ 4 $ 4 $ 12 $ 12 $ 10 $ 10 $ 100 $ 100 $ 100 $ 100   $ 19 $ 29 $ 75 $ 102 $ 54 $ 54 $ 147 $ 147 $ 11 $ 11   $ 250 $ 250 $ 190 $ 190   $ 81 $ 81   $ 185 $ 185 $ 15 $ 15
Debt instrument percentage, previously stated                                                                 0.0550 0.055         0.0565 0.0565                                                                                                                                                                                                        
Total Long-Term Debt 4,190 3,879     200           295 332 918 765     250           830 834 200 295 332 1,710 1,548 200                                                                                                                                                                                                                            
Net unamortized discount (13) (12)                     (1)                   (1) (2)       (9) (9)                                                                                                                                                                                                                              
Current portion of long-term debt (529) (73)                 (39) (37) 250 66                 (69)     39 37 200                                                                                                                                                                                       75 102                                      
Debt instrument, carrying value 3,648 3,794                 256 295 667 699                 760 832   256 295 1,501 1,540                                                                                                                                                                                         54 54                                  
Other long-term debt   $ 15                                                     $ 1   $ 13 $ 15                                                                                                                                                                                                                        
[1] On July 1, 2010, DPL purchased this series of tax-exempt bonds issued for the benefit of DPL by the Delaware Economic Development Authority (DEDA) pursuant to a mandatory repurchase provision in the indenture for the bonds that was triggered by the expiration of the original interest period for the bonds. While DPL held the bonds, they remained outstanding as a contractual matter, but were considered extinguished for accounting purposes. On December 1, 2010, DPL resold the bonds to the public, at which time the interest rate on the bonds was changed from 5.50% to a fixed rate of 1.80%. The bonds were purchased by DPL on June 1, 2012 pursuant to a mandatory purchase obligation and then retired.
[2] On July 1, 2010, DPL purchased this series of tax-exempt bonds issued for the benefit of DPL by DEDA pursuant to a mandatory repurchase provision in the indenture for the bonds that was triggered by the expiration of the original interest period for the bonds. While DPL held the bonds, they remained outstanding as a contractual matter, but were considered extinguished for accounting purposes. On December 1, 2010, DPL resold the bonds to the public, at which time the interest rate on the bonds was changed from 5.65% to a fixed rate of 2.30%. The bonds were purchased by DPL on June 1, 2012 pursuant to a mandatory purchase obligation and then retired.
[3] Represents a series of first mortgage bonds issued by the indicated company (Collateral First Mortgage Bonds) as collateral for an outstanding series of senior notes issued by the company or tax-exempt bonds issued for the benefit of the company. The maturity date, optional and mandatory prepayment provisions, if any, interest rate, and interest payment dates on each series of senior notes or the company's obligations in respect of the tax-exempt bonds are identical to the terms of the corresponding series of Collateral First Mortgage Bonds. Payments of principal and interest on a series of senior notes or the company's obligations in respect of the tax-exempt bonds satisfy the corresponding payment obligations on the related series of Collateral First Mortgage Bonds. Because each series of senior notes or the company's obligations in respect of the tax-exempt bonds and the corresponding series of Collateral First Mortgage Bonds securing that series of senior notes or tax-exempt bonds obligations effectively represents a single financial obligation, the senior notes and the tax-exempt bonds are not separately shown on the table.
[4] Represents a series of Collateral First Mortgage Bonds issued by the indicated company that in accordance with its terms will, at such time as there are no first mortgage bonds of the issuing company outstanding (other than Collateral First Mortgage Bonds securing payment of senior notes), cease to secure the corresponding series of senior notes and will be cancelled.
[5] Represents a series of first mortgage bonds issued by Pepco (Collateral First Mortgage Bonds) as collateral for an outstanding series of senior notes issued by the company or tax-exempt bonds issued for the benefit of the company. The maturity date, optional and mandatory prepayment provisions, if any, interest rate, and interest payment dates on each series of senior notes or the company's obligations in respect of the tax-exempt bonds are identical to the terms of the corresponding series of Collateral First Mortgage Bonds. Payments of principal and interest on a series of senior notes or the company's obligations in respect of the tax-exempt bonds satisfy the corresponding payment obligations on the related series of Collateral First Mortgage Bonds. Because each series of senior notes or the company's obligations in respect of the tax-exempt bonds and the corresponding series of Collateral First Mortgage Bonds securing that series of senior notes or tax-exempt bonds obligations effectively represents a single financial obligation, the senior notes and the tax-exempt bonds are not separately shown on the table.
[6] Represents a series of Collateral First Mortgage Bonds issued by Pepco that in accordance with its terms will, at such time as there are no first mortgage bonds of Pepco outstanding (other than Collateral First Mortgage Bonds securing payment of senior notes), cease to secure the corresponding series of senior notes and will be cancelled.
[7] Represents a series of Collateral First Mortgage Bonds as to which the indicated company has agreed in connection with the issuance of the corresponding series of senior notes that, notwithstanding the terms of the Collateral First Mortgage Bonds described in footnote (b) above, it will not permit the release of the Collateral First Mortgage Bonds as security for the series of senior notes for so long as the senior notes remain outstanding, unless the company delivers to the senior note trustee comparable secured obligations to secure the senior notes.
[8] Represents a series of Collateral First Mortgage Bonds as to which Pepco has agreed in connection with the issuance of the corresponding series of senior notes that, notwithstanding the terms of the Collateral First Mortgage Bonds described in footnote (b) above, it will not permit the release of the Collateral First Mortgage Bonds as security for the series of senior notes for so long as the senior notes remains outstanding, unless Pepco delivers to the senior note trustee comparable secured obligations to secure the senior notes.
[9] Represents a series of First Mortgage Bonds issued by ACE (Collateral First Mortgage Bonds) as collateral for an outstanding series of senior notes issued by the company or tax-exempt bonds issued by or for the benefit of ACE. The maturity date, optional and mandatory prepayment provisions, if any, interest rate, and interest payment dates on each series of senior notes or the obligations in respect of the tax-exempt bonds are identical to the terms of the corresponding series of Collateral First Mortgage Bonds. Payments of principal and interest on a series of senior notes or the company's obligation in respect of the tax-exempt bonds satisfy the corresponding payment obligations on the related series of Collateral First Mortgage Bonds. Because each series of senior notes and tax-exempt bonds and the corresponding series of Collateral First Mortgage Bonds securing that series of senior notes or tax-exempt bonds effectively represents a single financial obligation, the senior notes and the tax-exempt bonds are not separately shown on the table.
[10] Represents a series of Collateral First Mortgage Bonds issued by ACE that will, at such time as there are no first mortgage bonds of ACE outstanding (other than Collateral First Mortgage Bonds securing payment of senior notes), cease to secure the corresponding series of senior notes and will be cancelled.
[11] Represents a series of First Mortgage Bonds issued by DPL (Collateral First Mortgage Bonds) as collateral for an outstanding series of senior notes issued by the company or tax-exempt bonds issued for the benefit of the company. The maturity date, optional and mandatory prepayment provisions, if any, interest rate, and interest payment dates on each series of senior notes or the obligations in respect of the tax-exempt bonds are identical to the terms of the corresponding series of Collateral First Mortgage Bonds. Payments of principal and interest on a series of senior notes or the company's obligations in respect of the tax-exempt bonds satisfy the corresponding payment obligations on the related series of Collateral First Mortgage Bonds. Because each series of senior notes and tax-exempt bonds and the corresponding series of Collateral First Mortgage Bonds securing that series of senior notes or tax-exempt bonds effectively represents a single financial obligation, the senior notes and the tax-exempt bonds are not separately shown on the table.
[12] These bonds bearing an interest rate of 4.90% were repurchased. On June 1, 2011, DPL resold these bonds that were subject to mandatory repurchase on May 1, 2011 at an interest rate of 0.75%. The bonds were purchased by DPL on June 1, 2012 pursuant to a mandatory purchase obligation and then retired.