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Commitments and Contingencies Commitments and Contingencies - Schedule of Commercial Commitments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Guarantor Obligations [Line Items]  
Contractual Obligation $ 3,507
Contractual Obligation, Due in Next Fiscal Year 2,728
Contractual Obligation, Due in Second Year 344
Contractual Obligation, Due in Third Year 41
Contractual Obligation, Due in Fourth Year 3
Contractual Obligation, Due in Fifth Year 3
Contractual Obligation, Due after Fifth Year 388
Guarantee obligations maximum exposure 61
Exelon Generation Co L L C [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 2,900
Contractual Obligation, Due in Next Fiscal Year 2,581
Contractual Obligation, Due in Second Year 318
Contractual Obligation, Due in Third Year 1
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 0
Commonwealth Edison Co [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 214
Contractual Obligation, Due in Next Fiscal Year 12
Contractual Obligation, Due in Second Year 0
Contractual Obligation, Due in Third Year 2
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 200
PECO Energy Co [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 187
Contractual Obligation, Due in Next Fiscal Year 9
Contractual Obligation, Due in Second Year 0
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 178
Baltimore Gas and Electric Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 20
Contractual Obligation, Due in Next Fiscal Year 5
Contractual Obligation, Due in Second Year 15
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 0
Pepco Holdings LLC [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 73
Contractual Obligation, Due in Next Fiscal Year 44
Contractual Obligation, Due in Second Year 11
Contractual Obligation, Due in Third Year 2
Contractual Obligation, Due in Fourth Year 3
Contractual Obligation, Due in Fifth Year 3
Contractual Obligation, Due after Fifth Year 10
Potomac Electric Power Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 49
Contractual Obligation, Due in Next Fiscal Year 34
Contractual Obligation, Due in Second Year 9
Contractual Obligation, Due in Third Year 1
Contractual Obligation, Due in Fourth Year 1
Contractual Obligation, Due in Fifth Year 1
Contractual Obligation, Due after Fifth Year 3
Guarantee obligations maximum exposure 19
Delmarva Power & Light Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 15
Contractual Obligation, Due in Next Fiscal Year 6
Contractual Obligation, Due in Second Year 1
Contractual Obligation, Due in Third Year 1
Contractual Obligation, Due in Fourth Year 1
Contractual Obligation, Due in Fifth Year 1
Contractual Obligation, Due after Fifth Year 5
Guarantee obligations maximum exposure 26
Atlantic City Electric Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 9
Contractual Obligation, Due in Next Fiscal Year 4
Contractual Obligation, Due in Second Year 1
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 1
Contractual Obligation, Due in Fifth Year 1
Contractual Obligation, Due after Fifth Year 2
Guarantee obligations maximum exposure 16
Financial Standby Letter of Credit [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 1,703 [1]
Contractual Obligation, Due in Next Fiscal Year 1,394 [1]
Contractual Obligation, Due in Second Year 308 [1]
Contractual Obligation, Due in Third Year 1 [1]
Contractual Obligation, Due in Fourth Year 0 [1]
Contractual Obligation, Due in Fifth Year 0 [1]
Contractual Obligation, Due after Fifth Year 0 [1]
Financial Standby Letter of Credit [Member] | Exelon Generation Co L L C [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 1,680 [2]
Contractual Obligation, Due in Next Fiscal Year 1,380 [2]
Contractual Obligation, Due in Second Year 299 [2]
Contractual Obligation, Due in Third Year 1 [2]
Contractual Obligation, Due in Fourth Year 0 [2]
Contractual Obligation, Due in Fifth Year 0 [2]
Contractual Obligation, Due after Fifth Year 0 [2]
Financial Standby Letter of Credit [Member] | Commonwealth Edison Co [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 2 [3]
Contractual Obligation, Due in Next Fiscal Year 2 [3]
Contractual Obligation, Due in Second Year 0 [3]
Contractual Obligation, Due in Third Year 0 [3]
Contractual Obligation, Due in Fourth Year 0 [3]
Contractual Obligation, Due in Fifth Year 0 [3]
Contractual Obligation, Due after Fifth Year 0 [3]
Financial Standby Letter of Credit [Member] | Baltimore Gas and Electric Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 3 [4]
Contractual Obligation, Due in Next Fiscal Year 2 [4]
Contractual Obligation, Due in Second Year 1 [4]
Contractual Obligation, Due in Third Year 0 [4]
Contractual Obligation, Due in Fourth Year 0 [4]
Contractual Obligation, Due in Fifth Year 0 [4]
Contractual Obligation, Due after Fifth Year 0 [4]
Financial Standby Letter of Credit [Member] | Pepco Holdings LLC [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 8
Contractual Obligation, Due in Next Fiscal Year 0
Contractual Obligation, Due in Second Year 8
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 0
Financial Standby Letter of Credit [Member] | Potomac Electric Power Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 8
Contractual Obligation, Due in Next Fiscal Year 0
Contractual Obligation, Due in Second Year 8
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 0
Surety Bond [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 1,402 [5]
Contractual Obligation, Due in Next Fiscal Year 1,331 [5]
Contractual Obligation, Due in Second Year 33 [5]
Contractual Obligation, Due in Third Year 38 [5]
Contractual Obligation, Due in Fourth Year 0 [5]
Contractual Obligation, Due in Fifth Year 0 [5]
Contractual Obligation, Due after Fifth Year 0 [5]
Surety Bond [Member] | Exelon Generation Co L L C [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 1,220
Contractual Obligation, Due in Next Fiscal Year 1,201
Contractual Obligation, Due in Second Year 19
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 0
Surety Bond [Member] | Commonwealth Edison Co [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 12 [6]
Contractual Obligation, Due in Next Fiscal Year 10 [6]
Contractual Obligation, Due in Second Year 0 [6]
Contractual Obligation, Due in Third Year 2 [6]
Contractual Obligation, Due in Fourth Year 0 [6]
Contractual Obligation, Due in Fifth Year 0 [6]
Contractual Obligation, Due after Fifth Year 0 [6]
Surety Bond [Member] | PECO Energy Co [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 9 [7]
Contractual Obligation, Due in Next Fiscal Year 9 [7]
Contractual Obligation, Due in Second Year 0 [7]
Contractual Obligation, Due in Third Year 0 [7]
Contractual Obligation, Due in Fourth Year 0 [7]
Contractual Obligation, Due in Fifth Year 0 [7]
Contractual Obligation, Due after Fifth Year 0 [7]
Surety Bond [Member] | Baltimore Gas and Electric Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 17 [8]
Contractual Obligation, Due in Next Fiscal Year 3 [8]
Contractual Obligation, Due in Second Year 14 [8]
Contractual Obligation, Due in Third Year 0 [8]
Contractual Obligation, Due in Fourth Year 0 [8]
Contractual Obligation, Due in Fifth Year 0 [8]
Contractual Obligation, Due after Fifth Year 0 [8]
Surety Bond [Member] | Pepco Holdings LLC [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 41
Contractual Obligation, Due in Next Fiscal Year 41
Contractual Obligation, Due in Second Year 0
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 0
Surety Bond [Member] | Potomac Electric Power Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 33 [9]
Contractual Obligation, Due in Next Fiscal Year 33 [9]
Contractual Obligation, Due in Second Year 0 [9]
Contractual Obligation, Due in Third Year 0 [9]
Contractual Obligation, Due in Fourth Year 0 [9]
Contractual Obligation, Due in Fifth Year 0 [9]
Contractual Obligation, Due after Fifth Year 0 [9]
Surety Bond [Member] | Delmarva Power & Light Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 5 [10]
Contractual Obligation, Due in Next Fiscal Year 5 [10]
Contractual Obligation, Due in Second Year 0 [10]
Contractual Obligation, Due in Third Year 0 [10]
Contractual Obligation, Due in Fourth Year 0 [10]
Contractual Obligation, Due in Fifth Year 0 [10]
Contractual Obligation, Due after Fifth Year 0 [10]
Surety Bond [Member] | Atlantic City Electric Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 3
Contractual Obligation, Due in Next Fiscal Year 3
Contractual Obligation, Due in Second Year 0
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 0
Trust Preferred Securities [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 378
Contractual Obligation, Due in Next Fiscal Year 0
Contractual Obligation, Due in Second Year 0
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 378
Trust Preferred Securities [Member] | Commonwealth Edison Co [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 200
Contractual Obligation, Due in Next Fiscal Year 0
Contractual Obligation, Due in Second Year 0
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 200
Trust Preferred Securities [Member] | PECO Energy Co [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 178
Contractual Obligation, Due in Next Fiscal Year 0
Contractual Obligation, Due in Second Year 0
Contractual Obligation, Due in Third Year 0
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 178
GuaranteedLeaseResidualValues [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 24 [11]
Contractual Obligation, Due in Next Fiscal Year 3 [11]
Contractual Obligation, Due in Second Year 3 [11]
Contractual Obligation, Due in Third Year 2 [11]
Contractual Obligation, Due in Fourth Year 3 [11]
Contractual Obligation, Due in Fifth Year 3 [11]
Contractual Obligation, Due after Fifth Year 10 [11]
GuaranteedLeaseResidualValues [Member] | Pepco Holdings LLC [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 24 [12]
Contractual Obligation, Due in Next Fiscal Year 3 [12]
Contractual Obligation, Due in Second Year 3 [12]
Contractual Obligation, Due in Third Year 2 [12]
Contractual Obligation, Due in Fourth Year 3 [12]
Contractual Obligation, Due in Fifth Year 3 [12]
Contractual Obligation, Due after Fifth Year 10 [12]
GuaranteedLeaseResidualValues [Member] | Potomac Electric Power Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 8 [13]
Contractual Obligation, Due in Next Fiscal Year 1 [13]
Contractual Obligation, Due in Second Year 1 [13]
Contractual Obligation, Due in Third Year 1 [13]
Contractual Obligation, Due in Fourth Year 1 [13]
Contractual Obligation, Due in Fifth Year 1 [13]
Contractual Obligation, Due after Fifth Year 3 [13]
GuaranteedLeaseResidualValues [Member] | Delmarva Power & Light Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 10 [14]
Contractual Obligation, Due in Next Fiscal Year 1 [14]
Contractual Obligation, Due in Second Year 1 [14]
Contractual Obligation, Due in Third Year 1 [14]
Contractual Obligation, Due in Fourth Year 1 [14]
Contractual Obligation, Due in Fifth Year 1 [14]
Contractual Obligation, Due after Fifth Year 5 [14]
GuaranteedLeaseResidualValues [Member] | Atlantic City Electric Company [Member]  
Guarantor Obligations [Line Items]  
Contractual Obligation 6 [15]
Contractual Obligation, Due in Next Fiscal Year 1 [15]
Contractual Obligation, Due in Second Year 1 [15]
Contractual Obligation, Due in Third Year 0 [15]
Contractual Obligation, Due in Fourth Year 1 [15]
Contractual Obligation, Due in Fifth Year 1 [15]
Contractual Obligation, Due after Fifth Year $ 2 [15]
[1] _
[2] _
[3] _
[4] _
[5] Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.
[6] Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bond
[7] )Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bond
[8] Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bond
[9] (a)Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bond
[10] )Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bond
[11] Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The maximum lease term associated with these assets ranges from 3 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $61 million, $19 million of which is a guarantee by Pepco, $26 million by DPL and $16 million by ACE. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote.
[12] (a)Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.(b)Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The maximum lease term associated with these assets ranges from 3 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $61 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remot
[13] Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The maximum lease term associated with these assets ranges from 3 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $19 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and Pepco believes the likelihood of payments being required under the guarantees is remot
[14] )Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The maximum lease term associated with these assets ranges from 3 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $26 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and DPL believes the likelihood of payments being required under the guarantees is remot
[15] )Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.(b)Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The maximum lease term associated with these assets ranges from 3 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $16 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and ACE believes the likelihood of payments being required under the guarantees is remot