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Revenue (Notes) | 6 Months Ended
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Jun. 30, 2019
Revenue from Contracts with Customers [Abstract] |
Revenue from Contract with Customer [Text Block] | REVENUE The following table presents our revenue from contracts with customers and other revenue for the periods indicated (in millions):
| Three Months Ended June 30, 2019
| US and Utilities SBU |  | South America SBU |  | MCAC SBU |  | Eurasia SBU |  | Corporate, Other and Eliminations |  | Total
Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 706 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 706 |
Other regulated revenue | 18 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 18 |
Total regulated revenue | 724 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 724 |
Non-Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | 180 |  |  | 764 |  |  | 455 |  |  | 201 |  |  | (2 | ) |  | 1,598 |
Other non-regulated revenue (1) | 72 |  |  | 1 |  |  | 23 |  |  | 64 |  |  | 1 |  |  | 161 |
Total non-regulated revenue | 252 |  |  | 765 |  |  | 478 |  |  | 265 |  |  | (1 | ) |  | 1,759 |
Total revenue | $ | 976 |  |  | $ | 765 |  |  | $ | 478 |  |  | $ | 265 |  |  | $ | (1 | ) |  | $ | 2,483 |
| Three Months Ended June 30, 2018
| US and Utilities SBU |  | South America SBU |  | MCAC SBU |  | Eurasia SBU |  | Corporate, Other and Eliminations |  | Total
Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 706 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 706 |
Other regulated revenue | 10 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 10 |
Total regulated revenue | 716 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 716 |
Non-Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | 180 |  |  | 845 |  |  | 384 |  |  | 218 |  |  | — |  |  | 1,627 |
Other non-regulated revenue (1) | 99 |  |  | 1 |  |  | 22 |  |  | 74 |  |  | (2 | ) |  | 194 |
Total non-regulated revenue | 279 |  |  | 846 |  |  | 406 |  |  | 292 |  |  | (2 | ) |  | 1,821 |
Total revenue | $ | 995 |  |  | $ | 846 |  |  | $ | 406 |  |  | $ | 292 |  |  | $ | (2 | ) |  | $ | 2,537 |
| Six Months Ended June 30, 2019
| US and Utilities SBU |  | South America SBU |  | MCAC SBU |  | Eurasia SBU |  | Corporate, Other and Eliminations |  | Total
Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 1,484 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,484 |
Other regulated revenue | 25 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 25 |
Total regulated revenue | 1,509 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,509 |
Non-Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | 353 |  |  | 1,607 |  |  | 884 |  |  | 468 |  |  | (2 | ) |  | 3,310 |
Other non-regulated revenue (1) | 133 |  |  | 3 |  |  | 44 |  |  | 136 |  |  | (2 | ) |  | 314 |
Total non-regulated revenue | 486 |  |  | 1,610 |  |  | 928 |  |  | 604 |  |  | (4 | ) |  | 3,624 |
Total revenue | $ | 1,995 |  |  | $ | 1,610 |  |  | $ | 928 |  |  | $ | 604 |  |  | $ | (4 | ) |  | $ | 5,133 |
| Six Months Ended June 30, 2018
| US and Utilities SBU |  | South America SBU |  | MCAC SBU |  | Eurasia SBU |  | Corporate, Other and Eliminations |  | Total
Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 1,417 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,417 |
Other regulated revenue | 21 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21 |
Total regulated revenue | 1,438 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,438 |
Non-Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | 388 |  |  | 1,739 |  |  | 771 |  |  | 549 |  |  | (9 | ) |  | 3,438 |
Other non-regulated revenue (1) | 196 |  |  | 2 |  |  | 43 |  |  | 162 |  |  | (2 | ) |  | 401 |
Total non-regulated revenue | 584 |  |  | 1,741 |  |  | 814 |  |  | 711 |  |  | (11 | ) |  | 3,839 |
Total revenue | $ | 2,022 |  |  | $ | 1,741 |  |  | $ | 814 |  |  | $ | 711 |  |  | $ | (11 | ) |  | $ | 5,277 |
_______________________________ (1) Other non-regulated revenue primarily includes lease and derivative revenue not accounted for under ASC 606. Contract Balances — The timing of revenue recognition, billings, and cash collections results in accounts receivable and contract liabilities. The contract liabilities from contracts with customers were $127 million and $109 million as of June 30, 2019 and December 31, 2018, respectively. During the six months ended June 30, 2019 and 2018, we recognized revenue of $7 million and $29 million, respectively, that was included in the corresponding contract liability balance at the beginning of the periods. A significant financing arrangement exists for our Mong Duong plant in Vietnam. The plant was constructed under a build, operate, and transfer contract and will be transferred to the Vietnamese government after the completion of a 25 year PPA. The performance obligation to construct the facility was substantially completed in 2015. Approximately $1.4 billion of contract consideration related to the construction, but not yet collected through the 25 year PPA, was reflected as a loan receivable as of June 30, 2019. Remaining Performance Obligations — The transaction price allocated to remaining performance obligations represents future consideration for unsatisfied (or partially unsatisfied) performance obligations at the end of the reporting period. As of June 30, 2019, the aggregate amount of transaction price allocated to remaining performance obligations was $15 million, primarily consisting of fixed consideration for the sale of renewable energy credits (RECs) in long-term contracts in the U.S. We expect to recognize revenue on approximately one-fifth of the remaining performance obligations in 2019, with the remainder recognized thereafter. For further information on our accounting policies concerning contract balances and remaining performance obligations, see Note 18—Revenue in Item 8.—Financial Statements and Supplementary Data of our 2018 Form 10-K.

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- Definition Revenue from Contracts with Customers [Abstract] + References No definition available. + Details
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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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