ComEd 2006 Annual Report Download - page 279

Exelon Corporation and Subsidiary Companies
Exelon Generation Company, LLC and Subsidiary Companies
Commonwealth Edison Company and Subsidiary Companies
PECO Energy Company and Subsidiary Companies
Combined Notes to Consolidated Financial Statements—(Continued)
(Dollars in millions, except per share data unless otherwise noted)
The following table provides the components of accumulated other comprehensive loss that have
not been recognized as components of periodic benefit cost as of December 31, 2006 for the
AmerGen-sponsored plans:
Pension Benefits
Other Postretirement
Benefits
Prior service cost (credit) .................................. $ 6 $(13)
Actuarial loss (gain) ...................................... 15 (6)
Total .................................................. $21 $(19)
As of December 31, 2006, $1 million of the prior service cost related to pension benefits will be
amortized as components of periodic benefit cost in 2007. As of December 31, 2006, $2 million of the
prior service credit related to other postretirement benefits will be amortized as components of periodic
benefit cost in 2007.
The ABO for the AmerGen-sponsored defined benefit pension plans was $105 million and $95
million at December 31, 2006 and 2005, respectively. On an ABO basis, the plan was funded at 80% at
December 31, 2006 compared to 74% at December 31, 2005. On a PBO basis, the plans were funded
at 69% at December 31, 2006 compared to 65% at December 31, 2005.
The following table provides the components of the net periodic benefit costs for the years ended
December 31, 2006, 2005 and 2004 for the AmerGen-sponsored plans. A portion of the net periodic
benefit cost is capitalized within the Consolidated Balance Sheets.
Pension Benefits
Other Postretirement
Benefits
2006 2005 2004 2006 2005 2004
Service cost .......................................... $11 $10 $ 10 $ 9 $ 8 $ 6
Interest cost .......................................... 6 5 5545
Expected return on assets .............................. (6) (7) (4) — — —
Amortization of prior service cost ......................... 1 1 — (2) (2) —
Net periodic benefit cost ................................ $12 $ 9 $ 11 $ 12 $ 10 $ 11
AmerGen’s pension plan weighted average asset allocations at December 31, 2006 and 2005 and
target allocation at December 31, 2006 were as follows:
Target Allocation
at December 31, 2006
Percentage of Plan Assets
at December 31,
Asset Category 2006 2005
Equity securities .................................. 65% 69% 67%
Debt securities ................................... 35 31 33
Real estate ...................................... — — —
Total ........................................... 100% 100% 100%
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