Related Party Transactions	3 Months Ended
Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	Related Party Transactions We have entered into various agreements with related parties associated with the operation of our business. A description of these related party transactions is provided below: Calpine Receivables — Under the Accounts Receivable Sales Program, at March 31, 2019 and December 31, 2018, we had $256 million and $238 million, respectively, in trade accounts receivable outstanding that were sold to Calpine Receivables and $50 million and $34 million, respectively, in notes receivable from Calpine Receivables which were recorded on our Consolidated Condensed Balance Sheets. During the three months ended March 31, 2019 and 2018, we sold an aggregate of $597 million and $579 million, respectively, in trade accounts receivable and recorded $579 million and $573 million, respectively, in proceeds. For a further discussion of the Accounts Receivable Sales Program and Calpine Receivables, see Notes 7 and 17 in our 2018 Form 10-K. Lyondell — We have a ground lease agreement with Houston Refining LP (“Houston Refining”), a subsidiary of Lyondell, for our Channel Energy Center site from which we sell power, capacity and steam to Houston Refining under a PPA. We purchase refinery gas and raw water from Houston Refining under a facilities services agreement. One of the entities which obtained an ownership interest in Calpine through the Merger which closed on March 8, 2018, also has an ownership interest in Lyondell whereby they may significantly influence the management and operating policies of Lyondell. The terms of the PPA with Lyondell were negotiated prior to the Merger closing. We recorded $20 million and $19 million in Commodity revenue during the three months ended March 31, 2019 and 2018, respectively, and $3 million and $2 million in Commodity expense during the three months ended March 31, 2019 and 2018, respectively, associated with this contract with Lyondell. At March 31, 2019 and December 31, 2018, the related party receivable and payable associated with this contract with Lyondell were immaterial. Other — Following the Merger, we have identified other related party contracts for the sale of power, capacity and RECs which are entered into in the ordinary course of our business. Most of these contracts relate to the sale of commodities and capacity for varying tenors. The terms of most of these contracts were negotiated prior to the Merger. As of March 31, 2019 and December 31, 2018, the related party receivables and payables associated with these transactions were immaterial.

Related Party Transactions

We have entered into various agreements with related parties associated with the operation of our business. A description of these related party transactions is provided below:

Calpine Receivables — Under the Accounts Receivable Sales Program, at March 31, 2019 and December 31, 2018, we had $256 million and $238 million, respectively, in trade accounts receivable outstanding that were sold to Calpine Receivables and $50 million and $34 million, respectively, in notes receivable from Calpine Receivables which were recorded on our Consolidated Condensed Balance Sheets. During the three months ended March 31, 2019 and 2018, we sold an aggregate of $597 million and $579 million, respectively, in trade accounts receivable and recorded $579 million and $573 million, respectively, in proceeds. For a further discussion of the Accounts Receivable Sales Program and Calpine Receivables, see Notes 7 and 17 in our 2018 Form 10-K.

Lyondell — We have a ground lease agreement with Houston Refining LP (“Houston Refining”), a subsidiary of Lyondell, for our Channel Energy Center site from which we sell power, capacity and steam to Houston Refining under a PPA. We purchase refinery gas and raw water from Houston Refining under a facilities services agreement. One of the entities which obtained an ownership interest in Calpine through the Merger which closed on March 8, 2018, also has an ownership interest in Lyondell whereby they may significantly influence the management and operating policies of Lyondell. The terms of the PPA with Lyondell were negotiated prior to the Merger closing. We recorded $20 million and $19 million in Commodity revenue during the three months ended March 31, 2019 and 2018, respectively, and $3 million and $2 million in Commodity expense during the three months ended March 31, 2019 and 2018, respectively, associated with this contract with Lyondell. At March 31, 2019 and December 31, 2018, the related party receivable and payable associated with this contract with Lyondell were immaterial.

Other — Following the Merger, we have identified other related party contracts for the sale of power, capacity and RECs which are entered into in the ordinary course of our business. Most of these contracts relate to the sale of commodities and capacity for varying tenors. The terms of most of these contracts were negotiated prior to the Merger. As of March 31, 2019 and December 31, 2018, the related party receivables and payables associated with these transactions were immaterial.