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Related Party Transactions - Related Party Transactions included in Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current $ 5 $ 8
Due to Related Parties, Noncurrent 389 641
ComEd Financing Three Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 4 4
Due to Related Parties, Noncurrent 205 205
PECO Trust Three Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 1 1
Due to Related Parties, Noncurrent 81 81
PECO Trust Four Affiliate [Member]    
Related Party Transaction [Line Items]    
Due to Related Parties, Noncurrent 103 103
BGE Capital Trust II Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 0 3
Due to Related Parties, Noncurrent 0 252
Exelon Generation Co L L C [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 140 156
Notes Payable, Related Parties, Current 54 55
Accounts Payable, Related Parties, Current 123 137
Due to Related Parties, Noncurrent 910 922
Due to Affiliate, Noncurrent 3,065 2,608
Exelon Generation Co L L C [Member] | PECO Energy Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates [1] 26 33
Accounts Payable, Related Parties, Current [1] 4 0
Due to Affiliate, Noncurrent [2] 537 438
Exelon Generation Co L L C [Member] | Commonwealth Edison Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates [3] 28 14
Accounts Payable, Related Parties, Current 12 9
Due to Affiliate, Noncurrent [2] 2,528 2,169
Exelon Generation Co L L C [Member] | Delmarva Power and Light Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates [4] 12 16
Exelon Generation Co L L C [Member] | Potomac Electric Power Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates [5] 36 44
Exelon Generation Co L L C [Member] | Atlantic City Electric Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates [6] 6 9
Exelon Generation Co L L C [Member] | Baltimore Gas And Electric Company Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates [7] 24 26
Exelon Generation Co L L C [Member] | PHI Service Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates [8] 1 5
Exelon Generation Co L L C [Member] | Potomac Capital Investment Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 0 8
Notes Payable, Related Parties, Current 54 55
Exelon Generation Co L L C [Member] | Other Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 7 1
Accounts Payable, Related Parties, Current 12 7
Exelon Generation Co L L C [Member] | Exelon Corporation Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [9] 21 22
Due to Related Parties, Noncurrent [10] 910 922
Exelon Generation Co L L C [Member] | Exelon Business Services Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [8] 74 99
Due to Affiliate, Noncurrent [8] 0 1
Commonwealth Edison Co [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 13 356
Total receivable from affiliates (noncurrent) 2,528 2,170
Accounts Payable, Related Parties, Current 74 65
Due to Related Parties, Noncurrent 205 205
Commonwealth Edison Co [Member] | Exelon Generation Co LLC Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 12 9
Total receivable from affiliates (noncurrent) [11] 2,528 2,169
Accounts Payable, Related Parties, Current [12] 28 14
Commonwealth Edison Co [Member] | PECO Energy Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 0 2
Commonwealth Edison Co [Member] | ComEd Financing Three Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 4 4
Due to Related Parties, Noncurrent 205 205
Commonwealth Edison Co [Member] | Voluntary Employee Beneficiary Association Trust Affiliate [Member]    
Related Party Transaction [Line Items]    
Prepaid Expense Other, Noncurrent [13] 2 5
Receivables from affiliates 1 2
Commonwealth Edison Co [Member] | Other Affiliate [Member]    
Related Party Transaction [Line Items]    
Total receivable from affiliates (noncurrent) 0 1
Commonwealth Edison Co [Member] | Exelon Corporation Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates [14] 0 345
Accounts Payable, Related Parties, Current 3 3
Commonwealth Edison Co [Member] | Exelon Business Services Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [15] 39 42
Baltimore Gas and Electric Company [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 1  
Accounts Payable, Related Parties, Current 52 55
Due to Related Parties, Noncurrent 0 252
Baltimore Gas and Electric Company [Member] | Exelon Generation Co LLC Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [16] 24 26
Baltimore Gas and Electric Company [Member] | PECO Energy Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 0 2
Baltimore Gas and Electric Company [Member] | BGE Capital Trust II Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 0 3
Due to Related Parties, Noncurrent 0 252
Baltimore Gas and Electric Company [Member] | Other Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 1 0
Accounts Payable, Related Parties, Current 2 1
Baltimore Gas and Electric Company [Member] | Exelon Corporation Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 1 1
Baltimore Gas and Electric Company [Member] | Exelon Business Services Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [17] 25 22
Pepco Holdings LLC [Member] | Successor [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 90 94
Pepco Holdings LLC [Member] | Exelon Generation Co LLC Affiliate [Member] | Successor [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 54 74
Pepco Holdings LLC [Member] | Baltimore Gas And Electric Company Affiliate [Member] | Successor [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 1 0
Pepco Holdings LLC [Member] | Other Affiliate [Member] | Successor [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 5 4
Pepco Holdings LLC [Member] | Exelon Corporation Affiliate [Member] | Successor [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 6 6
Pepco Holdings LLC [Member] | Exelon Business Services Co Affiliate [Member] | Successor [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [18] 24 10
Potomac Electric Power Company [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 74 74
Potomac Electric Power Company [Member] | Exelon Generation Co LLC Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [19] 36 44
Potomac Electric Power Company [Member] | Delmarva Power and Light Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 0 1
Potomac Electric Power Company [Member] | PHI Service Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [20] 27 25
Potomac Electric Power Company [Member] | Exelon Business Services Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [20] 11 4
Delmarva Power and Light Company [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 0 3
Accounts Payable, Related Parties, Current 46 38
Delmarva Power and Light Company [Member] | Exelon Generation Co LLC Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [21] 12 16
Delmarva Power and Light Company [Member] | Potomac Electric Power Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 0 1
Delmarva Power and Light Company [Member] | Atlantic City Electric Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 0 2
Delmarva Power and Light Company [Member] | PHI Service Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [22] 27 19
Delmarva Power and Light Company [Member] | Exelon Business Services Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [22] 7 3
Atlantic City Electric Company [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 29 29
Atlantic City Electric Company [Member] | Exelon Generation Co LLC Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [23] 6 9
Atlantic City Electric Company [Member] | Delmarva Power and Light Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 0 2
Atlantic City Electric Company [Member] | PHI Service Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [24] 18 16
Atlantic City Electric Company [Member] | Exelon Business Services Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [24] 5 2
PECO Energy Co [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 0 4
Total receivable from affiliates (noncurrent) 537 438
Accounts Payable, Related Parties, Current 53 63
Due to Related Parties, Noncurrent 184 184
PECO Energy Co [Member] | Exelon Generation Co LLC Affiliate [Member]    
Related Party Transaction [Line Items]    
Total receivable from affiliates (noncurrent) [25] 537 438
Accounts Payable, Related Parties, Current [26] 22 33
PECO Energy Co [Member] | Commonwealth Edison Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 0 2
PECO Energy Co [Member] | PECO Trust Three Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 1 1
Due to Related Parties, Noncurrent 81 81
PECO Energy Co [Member] | PECO Trust Four Affiliate [Member]    
Related Party Transaction [Line Items]    
Due to Related Parties, Noncurrent 103 103
PECO Energy Co [Member] | Baltimore Gas And Electric Company Affiliate [Member]    
Related Party Transaction [Line Items]    
Receivables from affiliates 0 2
PECO Energy Co [Member] | Voluntary Employee Beneficiary Association Trust Affiliate [Member]    
Related Party Transaction [Line Items]    
Prepaid Expense Other, Noncurrent [27] 0 1
PECO Energy Co [Member] | Exelon Corporation Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current 1 1
PECO Energy Co [Member] | Exelon Business Services Co Affiliate [Member]    
Related Party Transaction [Line Items]    
Accounts Payable, Related Parties, Current [28] $ 29 $ 28
[1] Generation provides electric supply to PECO under contracts executed through PECO’s competitive procurement process. In addition, Generation has a ten-year agreement with PECO to sell solar AECs. See Note 3—Regulatory Matters for additional information.
[2] Generation has long-term payables to ComEd and PECO as a result of the nuclear decommissioning contractual construct whereby, to the extent NDT funds are greater than the underlying ARO at the end of decommissioning, such amounts are due back to ComEd and PECO, as applicable, for payment to their respective customers. See Note 15—Asset Retirement Obligations.
[3] Generation has an ICC-approved RFP contract with ComEd to provide a portion of ComEd’s electricity supply requirements. Generation also sells RECs to ComEd. In addition, Generation had revenue from ComEd associated with the settled portion of the financial swap contract established as part of the Illinois Settlement. See Note 3—Regulatory Matters for additional information.
[4] (e)Generation provides a portion of DPL's energy requirements under its MDPSC and DPSC approved market based SOS and gas commodity programs. See Note 3—Regulatory Matters for additional information.
[5] (d)Generation provides electric supply to Pepco under contracts executed through Pepco's competitive procurement process approved by the MDPSC and DCPSC. See Note 3—Regulatory Matters for additional information.
[6] Generation provides electric supply to ACE under contracts executed through ACE's competitive procurement process. See Note 3—Regulatory Matters for additional information.
[7] Generation provides a portion of BGE’s energy requirements under its MDPSC-approved market-based SOS and gas commodity programs. See Note 3—Regulatory Matters for additional information.
[8] Generation receives a variety of corporate support services from BSC and PHISCO, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.
[9] The balance consists of interest owed to Exelon Corporation related to the senior unsecured notes, as well as, expense related to certain invoices Exelon Corporation processed on behalf of Generation.
[10] In connection with the debt obligations assumed by Exelon as part of the Constellation merger, Exelon and subsidiaries of Generation (former Constellation subsidiaries) assumed intercompany loan agreements that mirror the terms and amounts of the third-party debt obligations of Exelon, resulting in intercompany notes payable included in Long-term Debt to affiliate on Generation’s Consolidated Balance Sheets and intercompany notes receivable at Exelon Corporate, which are eliminated in consolidation on Exelon’s Consolidated Balance Sheets.
[11] ComEd has a long-term receivable from Generation as a result of the nuclear decommissioning contractual construct for generating facilities previously owned by ComEd. To the extent the assets associated with decommissioning are greater than the applicable ARO at the end of decommissioning, such amounts are due back to ComEd for payment to ComEd’s customers.
[12] ComEd procures a portion of its electricity supply requirements from Generation under an ICC-approved RFP contract. ComEd also purchases RECs from Generation. In addition, purchased power expense includes the settled portion of the financial swap contract with Generation, which expired in 2013. See Note 3—Regulatory Matters and Note 12—Derivative Financial Instruments for additional information.
[13] The voluntary employee benefit association trusts covering active employees are included in corporate operations and are funded by the Registrants. A prepayment to the active welfare plans has accumulated due to actuarially determined contribution rates, which are the basis for ComEd’s contributions to the plans, being higher than actual claim expense incurred by the plans over time. The prepayment is included in other current assets.
[14] Represents indemnification from Exelon Corporate related to the like-kind exchange.
[15] ComEd receives a variety of corporate support services from BSC, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.
[16] BGE procures a portion of its electricity and gas supply requirements from Generation under its MDPSC-approved market-based SOS and gas commodity programs. See Note 3—Regulatory Matters for additional information.
[17] BGE receives a variety of corporate support services from BSC, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.
[18] PHI receives a variety of corporate support services from BSC and PHISCO, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.
[19] Pepco procures a portion of its electricity and gas supply requirements from Generation under its MDPSC and DPSC approved market based SOS and gas commodity programs. See Note 3—Regulatory Matters for additional information.
[20] Pepco receives a variety of corporate support services from BSC and PHISCO, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.
[21] DPL procures a portion of its electricity and gas supply requirements from Generation under its MDPSC and DPSC approved market based SOS and gas commodity programs. See Note 3—Regulatory Matters for additional information.
[22] DPL receives a variety of corporate support services from BSC and PHISCO, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.
[23] (a)ACE purchases electric supply from Generation under contracts executed through its competitive procurement process. See Note 3—Regulatory Matters for additional information.
[24] ACE receives a variety of corporate support services from BSC and PHISCO, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.
[25] PECO has a long-term receivable from Generation as a result of the nuclear decommissioning contractual construct, whereby, to the extent the assets associated with decommissioning are greater than the applicable ARO at the end of decommissioning, such amounts are due back to PECO for payment to PECO’s customers.
[26] PECO purchases electric supply from Generation under contracts executed through its competitive procurement process. In addition, PECO has five-year and ten-year agreements with Generation to purchase non-solar and solar AECs, respectively. See Note 3—Regulatory Matters for additional information on AECs.
[27] The voluntary employee beneficiary association trusts covering active employees are included in corporate operations and are funded by the Registrants. A prepayment to the active welfare plans has accumulated due to actuarially determined contribution rates, which are the basis for PECO’s contributions to the plans, being higher than actual claim expense incurred by the plans over time.
[28] PECO receives a variety of corporate support services from BSC, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.