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Related Party Transactions - Credit Agreement with GenOn and Commercial Operations Agreement (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Related Party Transaction [Line Items] |  |
Long-term debt | $ 6,691,000,000 | $ 9,494,000,000
Cash collateral posted in support of energy risk management activities | 287,000,000 | 171,000,000
GenOn |  |
Related Party Transaction [Line Items] |  |
Cash collateral posted in support of energy risk management activities | 4,000,000 | 32,000,000
Revolving Credit Facility | Intercompany Credit Agreement | GenOn |  |
Related Party Transaction [Line Items] |  |
Revolving credit facility | 500,000,000 |
Letters of credit outstanding under revolver | $ 30,000,000 | $ 92,000,000

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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