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Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Related Party Transactions - Summary of Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  | $ (28) | $ (32) | $ (24)
Payables to affiliates, current |  | 5 | 5 |
Exelon Corporate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | [1] | 9 | 25 | 51
Interest income from affiliates, net |  | 42 | 40 | 39
Equity in earnings (losses) of unconsolidated affiliates |  | 2,188 | 4,414 | 1,508
Cash contributions received from affiliates |  | 2,302 | 1,879 | 1,912
Accounts receivable from affiliates, current |  | 44 | 33 |
Note receivable from affiliates, current |  | 216 | 217 |
Investments in affiliates |  | 40,448 | 39,311 |
Notes receivable from affiliates, noncurrent |  | 898 | 910 |
Payables to affiliates, current |  | 360 | 360 |
Exelon Corporate [Member] | Exelon Business Services Co Affiliate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | [1] | 11 | 23 | 51
Interest income from affiliates, net |  | 4 | 3 | 0
Equity in earnings (losses) of unconsolidated affiliates |  | 0 | 1 | 1
Accounts receivable from affiliates, current | [1] | 13 | 1 |
Note receivable from affiliates, current | [1] | 116 | 217 |
Investments in affiliates | [1] | 197 | 196 |
Exelon Corporate [Member] | Other Affiliate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates |  | (2) | 2 | 0
Investments in affiliates |  | (6) | (6) |
Exelon Corporate [Member] | Exelon Generation Co L L C [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest income from affiliates, net |  | 36 | 37 | 39
Equity in earnings (losses) of unconsolidated affiliates |  | 369 | 2,710 | 483
Accounts receivable from affiliates, current |  | 17 | 21 |
Note receivable from affiliates, current | [2] | 100 | 0 |
Investments in affiliates |  | 13,204 | 13,674 |
Notes receivable from affiliates, noncurrent | [2] | 898 | 910 |
Exelon Corporate [Member] | Commonwealth Edison Co [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Accounts receivable from affiliates, current |  | 4 | 3 |
Exelon Corporate [Member] | PECO Energy Co [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Accounts receivable from affiliates, current |  | 2 | 1 |
Exelon Corporate [Member] | Baltimore Gas and Electric Company [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Accounts receivable from affiliates, current |  | 2 | 1 |
Exelon Corporate [Member] | PHI Service Co Affiliate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Accounts receivable from affiliates, current |  | 6 | 6 |
Exelon Corporate [Member] | Exelon Energy Delivery Company LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest income from affiliates, net | [3] | 2 | 0 | 0
Equity in earnings (losses) of unconsolidated affiliates | [3] | 1,835 | 1,670 | 1,041
Investments in affiliates | [3] | 26,702 | 25,082 |
Exelon Corporate [Member] | Potomac Capital Investment Affiliate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  | (17) | 1 | 6
Investments in affiliates |  | 61 | 78 |
Exelon Corporate [Member] | UII LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  | 0 | 41 | (9)
Investments in affiliates |  | 268 | 268 |
Payables to affiliates, current |  | 360 | 360 |
Exelon Corporate [Member] | Exelon Transmission Company LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  | 1 | (10) | (13)
Investments in affiliates |  | 1 | 1 |
Exelon Corporate [Member] | VEBA [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Investments in affiliates |  | (1) | (4) |
Exelon Corporate [Member] | Exelon Enterprise [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  | 0 | 1 | $ (1)
Investments in affiliates |  | $ 22 | $ 22 |
[1] | Exelon Corporate 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.
[2] | 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 affiliates in Generation’s Consolidated Balance Sheets and intercompany notes receivable at Exelon Corporate, which are eliminated in consolidation in Exelon’s Consolidated Balance Sheets.
[3] | Exelon Energy Delivery Company, LLC consists of ComEd, PECO, BGE, PHI, Pepco, DPL and ACE.

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