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Debt and Credit Agreements (Tables)
 12 Months Ended
Dec. 31, 2020
Short-term Debt [Line Items]  
Schedule of commercial paper, credit facilities, and borrowing rates
Borrowings under Exelon’s, Generation’s, ComEd’s, PECO’s, BGE's, Pepco's, DPL's, and ACE's revolving credit agreements bear interest at a rate based upon either the prime rate or a LIBOR-based rate, plus an adder based upon the particular Registrant’s credit rating. The adders for the prime based borrowings and LIBOR-based borrowings are presented in the following table:
Exelon(a)
GenerationComEdPECOBGEPepcoDPLACE
Prime based borrowings 0 - 27.527.5 — — — 7.5 — 7.5 
LIBOR-based borrowings90.0 - 127.5127.5 100.0 90.0 90.0 107.5 100.0 107.5 
__________
(a)Includes interest rate adders at Exelon Corporate of 27.5 and 127.5 for prime and LIBOR-based borrowings, respectively.
Schedule of bilateral credit agreements
Bilateral Credit Agreements
The following table reflects the bilateral credit agreements at December 31, 2020:
RegistrantDate Initiated Latest Amendment Date
Maturity Date(a)
 Amount
Generation(b)
October 26, 2012October 23, 2020October 22, 2021$200 
Generation(c)
January 11, 2013January 4, 2019March 1, 2021100
Generation(c)
January 5, 2016January 4, 2019April 5, 2021150
Generation(c)
February 21, 2019N/AMarch 31, 2021100
Generation(c)
October 25, 2019N/AN/A200
Generation(c)
October 25, 2019N/AN/A100
Generation(c)
November 20, 2019N/AN/A300
Generation(c)
November 21, 2019N/AN/A150
Generation(c)
November 21, 2019N/ANovember 21, 2021100
Generation(c)
May 15, 2020N/AN/A100
__________
(a)Credit facilities that do not contain a maturity date are specific to the agreements set within each contract. In some instances, credit facilities are automatically renewed based on the contingency standards set within the specific agreement.
(b)Bilateral credit facility relates to CENG, which is incorporated within Generation, and supports the issuance of letters of credit and funding for working capital and does not back Generation's commercial paper program. During the second and third quarters of 2020, CENG drew on its bilateral credit facility. As of December 31, 2020, there was no outstanding balance at this facility.
(c)Bilateral credit agreements solely support the issuance of letters of credit and do not back Generation's commercial paper program.
Schedule of long-term debt instruments
Long-Term Debt 
The following tables present the outstanding long-term debt at the Registrants as of December 31, 2020 and 2019:
Exelon
Maturity
Date		December 31,
Rates20202019
Long-term debt
First mortgage bonds(a)
0.19 %-7.90 %2021 - 2050$18,915 $17,486 
Senior unsecured notes2.45 %-7.60 %2021 - 205010,585 10,685 
Unsecured notes2.40 %-6.35 %2021 - 20503,700 3,300 
Pollution control notes2.50 %-2.70 %2020— 412 
Nuclear fuel procurement contracts3.15 %2020— 3 
Notes payable and other2.10 %-7.99 %2021 - 2053170 154 
Junior subordinated notes3.50 %20221,150 1,150 
Long-term software licensing agreement3.95 %202430 55 
Unsecured tax-exempt bonds0.17 %-1.70 %2022 - 2024143 222 
Medium-terms notes (unsecured)7.72 %202710 10 
Transition bonds5.55 %202121 40 
Loan agreement2.00 %202350 50 
Nonrecourse debt:
     Fixed rates2.29 %-6.00 %2031 - 2037977 1,182 
     Variable rates2.99 %-3.18 %2021 - 2027765 811 
Total long-term debt36,516 35,560 
Unamortized debt discount and premium, net(77)(72)
Unamortized debt issuance costs (248)(214)
Fair value adjustment721 765 
Long-term debt due within one year(1,819)(4,710)
Long-term debt$35,093 $31,329 
Long-term debt to financing trusts(b)
Subordinated debentures to ComEd Financing III6.35 %2033$206 $206 
Subordinated debentures to PECO Trust III5.25 %-7.38 %202881 81 
Subordinated debentures to PECO Trust IV5.75 %2033103 103 
Total long-term debt to financing trusts$390 $390 
__________
(a)Substantially all of ComEd’s assets other than expressly excepted property and substantially all of PECO’s, Pepco's, DPL's, and ACE's assets are subject to the liens of their respective mortgage indentures.
(b)Amounts owed to these financing trusts are recorded as Long-term debt to financing trusts within Exelon’s Consolidated Balance Sheets.
Generation
Maturity
Date		December 31,
Rates20202019
Long-term debt
Senior unsecured notes3.25 %-7.60 %2022 - 2042$4,219 $5,420 
Pollution control notes2.50 %-2.70 %2020— 412 
Nuclear fuel procurement contracts3.15 %2020— 3 
Notes payable and other2.10 %-4.85 %2021 - 2028111 115 
Nonrecourse debt:
Fixed rates2.29 %-6.00 %2031 - 2037977 1,182 
Variable rates2.99 %-3.18 %2021 - 2027765 811 
Total long-term debt6,072 7,943 
Unamortized debt discount and premium, net(5)(5)
Unamortized debt issuance costs(46)(42)
Fair value adjustment66 78 
Long-term debt due within one year(197)(3,182)
Long-term debt$5,890 $4,792 

ComEd
Maturity
Date		December 31,
Rates20202019
Long-term debt
First mortgage bonds(a)
2.20 %-6.45 %2021 - 2050$9,079 $8,578 
Other7.49 %20538 8 
Total long-term debt9,087 8,586 
Unamortized debt discount and premium, net(28)(27)
Unamortized debt issuance costs(76)(68)
Long-term debt due within one year(350)(500)
Long-term debt$8,633 $7,991 
Long-term debt to financing trust(b)
Subordinated debentures to ComEd Financing III6.35 %2033$206 $206 
Total long-term debt to financing trusts206 206 
Unamortized debt issuance costs (1)(1)
Long-term debt to financing trusts $205 $205 
__________
(a)Substantially all of ComEd’s assets, other than expressly excepted property, are subject to the lien of its mortgage indenture.
(b)Amount owed to this financing trust is recorded as Long-term debt to financing trust within ComEd’s Consolidated Balance Sheets.
PECO
Maturity
Date		December 31,
Rates20202019
Long-term debt
First mortgage bonds(a)
1.70 %-5.95 %2021 - 2050$3,750 $3,400 
Loan agreement2.00 %202350 50 
Total long-term debt3,800 3,450 
Unamortized debt discount and premium, net(20)(21)
Unamortized debt issuance costs(27)(24)
Long-term debt due within one year(300)— 
Long-term debt$3,453 $3,405 
Long-term debt to financing trusts(b)
Subordinated debentures to PECO Trust III5.25 %-7.38 %2028$81 $81 
Subordinated debentures to PECO Trust IV5.75 %2033103 103 
Long-term debt to financing trusts $184 $184 
__________
(a)Substantially all of PECO’s assets are subject to the lien of its mortgage indenture.
(b)Amounts owed to this financing trust are recorded as Long-term debt to financing trusts within PECO’s Consolidated Balance Sheets.
BGE
Maturity
Date		December 31,
Rates20202019
Long-term debt
Unsecured notes2.40 %-6.35 %2021 - 2050$3,700 $3,300 
Total long-term debt3,700 3,300 
Unamortized debt discount and premium, net(12)(9)
Unamortized debt issuance costs(24)(21)
Long-term debt due within one year(300)— 
Long-term debt$3,364 $3,270 
PHI
Maturity
Date		December 31,
Rates20202019
Long-term debt
First mortgage bonds(a)
0.19 %-7.90 %2021 - 2050$6,086 $5,508 
Senior unsecured notes
7.45 %2032185 185 
Unsecured tax-exempt bonds0.17 %-1.70 %2022 - 2024143 222 
Medium-terms notes (unsecured)7.72 %202710 10 
Transition bonds5.55 %202121 40 
Finance leases3.54 %2022 - 202850 28 
Other7.28 %-7.99 %2021 - 20221 2 
Total long-term debt6,496 5,995 
Unamortized debt discount and premium, net4 4 
Unamortized debt issuance costs(28)(19)
Fair value adjustment534 583 
Long-term debt due within one year(347)(103)
Long-term debt$6,659 $6,460 
_________
(a)Substantially all of Pepco's, DPL's, and ACE's assets are subject to the liens of their respective mortgage indentures.

Pepco
Maturity
Date		December 31,
Rates20202019
Long-term debt
First mortgage bonds(a)
2.53 %-7.90 %2022 - 2050$3,075 $2,775 
Unsecured tax-exempt bonds1.70 %2022110 110 
Finance leases3.54 %2025 - 202817 10 
Other7.28 %-7.99 %2021 - 20221 2 
Total long-term debt3,203 2,897 
Unamortized debt discount and premium, net2 2 
Unamortized debt issuance costs(40)(35)
Long-term debt due within one year(3)(2)
Long-term debt$3,162 $2,862 
__________
(a)Substantially all of Pepco's assets are subject to the lien of its mortgage indenture.
DPL
Maturity
Date		December 31,
Rates20202019
Long-term debt
First mortgage bonds(a)
0.19 %-4.27 %2023 - 2049$1,624 $1,446 
Unsecured tax-exempt bonds0.17 %-0.20 %202433 112 
Medium-terms notes (unsecured)
7.72 %202710 10 
Finance leases3.54 %2025 - 202820 10 
Total long-term debt1,687 1,578 
Unamortized debt discount and premium, net1 1 
Unamortized debt issuance costs(11)(12)
Long-term debt due within one year(82)(80)
Long-term debt$1,595 $1,487 
__________
(a)Substantially all of DPL's assets are subject to the lien of its mortgage indenture.

ACE
Maturity
Date		December 31,
Rates20202019
Long-term debt
First mortgage bonds(a) 
2.25 %-6.80 %2021 - 2050$1,387 $1,287 
Transition bonds5.55 %202121 40 
Finance leases3.54 %2022 - 202813 8 
Total long-term debt1,421 1,335 
Unamortized debt discount and premium, net(1)(1)
Unamortized debt issuance costs(7)(7)
Long-term debt due within one year(261)(20)
Long-term debt$1,152 $1,307 
__________
(a)Substantially all of ACE's assets are subject to the lien of its mortgage indenture.
Schedule of maturities of long-term debt
Long-term debt maturities at the Registrants in the periods 2021 through 2025 and thereafter are as follows:
YearExelon GenerationComEdPECOBGE PHIPepcoDPLACE
2021$1,819 $197 $350 $300 $300  $347 $3 $82 $261 
20223,092 1,025 — 350 250  317 312 3 2 
2023859 1 — 50 300  508 3 503 2 
2024814 1 250 — —  558 403 3 152 
20252,215 900 — 350 —  158 3 3 152 
Thereafter28,107 
(a) 
3,948 8,692 
(b)
2,934 
(c)
2,850 4,608 2,479 1,093 852 
Total$36,906  $6,072 $9,292 $3,984 $3,700 $6,496 $3,203 $1,687 $1,421 
__________
(a)Includes $390 million due to ComEd and PECO financing trusts.
(b)Includes $206 million due to ComEd financing trust.
(c)Includes $184 million due to PECO financing trusts.
Commercial Paper  
Short-term Debt [Line Items]  
Schedule of commercial paper, credit facilities, and borrowing rates
The following table reflects the Registrants' commercial paper programs supported by the revolving credit agreements and bilateral credit agreements at December 31, 2020 and 2019:
Maximum
Program Size at
December 31,		Outstanding
Commercial
Paper at
December 31,		Average Interest Rate on
Commercial Paper Borrowings at December 31,
Commercial Paper Issuer
2020(a)(b)(c)
2019(a)(b)(c)
2020201920202019
Exelon(d)
$9,000 $9,000 $1,031 $870 0.25 %2.25 %
Generation5,300 5,300 340 320 0.27 %1.84 %
ComEd1,000 1,000 323 130 0.23 %2.38 %
PECO600 600 — — — %2.39 %
BGE600 600 — 76 — %2.46 %
PHI(e)
900 900 368 208 0.24 %N/A
Pepco300 300 35 82 0.22 %2.56 %
DPL300 300 146 56 0.24 %2.02 %
ACE300 300 187 70 0.25 %2.43 %
__________
(a)Excludes $1,500 million and $1,400 million in bilateral credit facilities at December 31, 2020 and 2019, respectively, and $144 million and $159 million in credit facilities for project finance at December 31, 2020 and 2019, respectively. These credit facilities do not back Generation's commercial paper program.
(b)At December 31, 2020, excludes $135 million of credit facility agreements arranged at minority and community banks at Generation, ComEd, PECO, BGE, Pepco, DPL, and ACE with aggregate commitments of $38 million, $32 million, $33 million, $8 million, $8 million, $8 million, and $8 million, respectively. These facilities expire on October 8, 2021. These facilities are solely utilized to issue letters of credit. At December 31, 2019, excludes $142 million of credit facility agreements arranged at minority and community banks at Generation, ComEd, PECO, BGE, Pepco, DPL, and ACE with aggregate commitments of $44 million, $33 million, $33 million, $8 million, $8 million, $8 million, and $8 million, respectively.
(c)Pepco, DPL, and ACE's revolving credit facility has the ability to flex to $500 million, $500 million, and $350 million, respectively. The borrowing capacity may be increased or decreased during the term of the facility, except that (i) the sum of the borrowing capacity must equal the total amount of the facility, and (ii) the aggregate amount of credit used at any given time by each of Pepco, DPL, or ACE may not exceed $900 million or the maximum amount of short-term debt the company is permitted to have outstanding by its regulatory authorities. The total number of the borrowing reallocations may not exceed eight per year during the term of the facility.
(d)Includes revolving credit agreement at Exelon Corporate with a maximum program size of $600 million at both December 31, 2020 and 2019, respectively. Exelon Corporate had no outstanding commercial paper as of December 31, 2020 and $136 million at 2019 with an average interest rate on commercial paper borrowings of 1.92%.
(e)Represents the consolidated amounts of Pepco, DPL, and ACE.
Revolving Credit Facility  
Short-term Debt [Line Items]  
Schedule of commercial paper, credit facilities, and borrowing rates
At December 31, 2020, the Registrants had the following aggregate bank commitments, credit facility borrowings, and available capacity under their respective credit facilities:
Available Capacity at December 31, 2020
Borrower(a)
Facility Type
Aggregate Bank
Commitment(b)
Facility DrawsOutstanding
Letters of Credit		Actual
To Support
Additional
Commercial
Paper(c)
Exelon(c)
Syndicated Revolver / Bilaterals / Project Finance$10,644 $— $1,230 $9,414 $7,698 
GenerationSyndicated Revolver5,300 — 262 5,038 4,698 
GenerationBilaterals1,500 — 840 660 — 
GenerationProject Finance144 — 119 25 — 
ComEdSyndicated Revolver1,000 — 2 998 675 
PECOSyndicated Revolver600 — — 600 600 
BGESyndicated Revolver600 — — 600 600 
PHI Syndicated Revolver900 — 1 899 531 
PepcoSyndicated Revolver300 — 1 299 264 
DPLSyndicated Revolver300 — — 300 154 
ACESyndicated Revolver300 — — 300 113 
__________
(a)On May 26, 2018, each of the Registrants' respective syndicated revolving credit facilities had their maturity dates extended to May 26, 2023.
(b)Excludes $135 million of credit facility agreements arranged at minority and community banks at Generation, ComEd, PECO, BGE, Pepco, DPL, and ACE with aggregate commitments of $38 million, $32 million, $33 million, $8 million, $8 million, $8 million, and $8 million, respectively. These facilities expire on October 8, 2021. These facilities are solely utilized to issue letters of credit. As of December 31, 2020, letters of credit issued under these facilities totaled $5 million, $5 million, and $2 million for Generation, ComEd, and BGE, respectively.
(c)Includes $600 million aggregate bank commitment related to Exelon Corporate. Exelon Corporate had $6 million outstanding letters of credit at December 31, 2020. Exelon Corporate had $594 million in available capacity to support additional commercial paper at December 31, 2020.