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Revenue (Notes) | 12 Months Ended
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Dec. 31, 2018
Revenue [Abstract] |
Revenue from Contract with Customer [Text Block] | The following table presents our revenue from contracts with customers and other revenue for the year ended December 31, 2018 (in millions):
| Year Ended December 31, 2018
| US and Utilities SBU |  | South America SBU |  | MCAC SBU |  | Eurasia SBU |  | Corporate, Other and Eliminations |  | Total
Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 2,885 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,885 |
Other regulated revenue | 54 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 54 |
Total regulated revenue | $ | 2,939 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,939 |
Non-Regulated Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ | 972 |  |  | $ | 3,529 |  |  | $ | 1,642 |  |  | $ | 943 |  |  | $ | (11 | ) |  | $ | 7,075 |
Other non-regulated revenue (1) | 319 |  |  | 4 |  |  | 86 |  |  | 312 |  |  | 1 |  |  | 722 |
Total non-regulated revenue | $ | 1,291 |  |  | $ | 3,533 |  |  | $ | 1,728 |  |  | $ | 1,255 |  |  | $ | (10 | ) |  | $ | 7,797 |
Total revenue | $ | 4,230 |  |  | $ | 3,533 |  |  | $ | 1,728 |  |  | $ | 1,255 |  |  | $ | (10 | ) |  | $ | 10,736 |
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(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. Accounts receivable represent unconditional rights to consideration and consist of both billed amounts and unbilled amounts typically resulting from sales under long-term contracts when revenue recognized exceeds the amount billed to the customer. We bill both generation and utilities customers on a contractually agreed-upon schedule, typically at periodic intervals (e.g., monthly). The calculation of revenue earned but not yet billed is based on the number of days not billed in the month, the estimated amount of energy delivered during those days and the estimated average price per customer class for that month. Our contract liabilities consist of deferred revenue which is classified as current or noncurrent based on the timing of when we expect to recognize revenue. The current portion of our contract liabilities is reported in Accrued and other liabilities and the noncurrent portion is reported in Other noncurrent liabilities on the Consolidated Balance Sheets. The contract liabilities from contracts with customers were $109 million and $131 million as of December 31, 2018 and January 1, 2018, respectively. Of the $131 million of contract liabilities reported at January 1, 2018, $36 million was recognized as revenue during the period ended December 31, 2018. 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 December 31, 2018. 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 December 31, 2018, 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. The Company has elected to apply the optional disclosure exemptions under ASC 606. Therefore, the amount above excludes contracts with an original length of one year or less, contracts for which we recognize revenue based on the amount we have the right to invoice for services performed, and variable consideration allocated entirely to a wholly unsatisfied performance obligation when the consideration relates specifically to our efforts to satisfy the performance obligation and depicts the amount to which we expect to be entitled. As such, consideration for energy is excluded from the amounts above as the variable consideration relates to the amount of energy delivered and reflects the value the Company expects to receive for the energy transferred. Estimates of revenue expected to be recognized in future periods also exclude unexercised customer options to purchase additional goods or services that do not represent material rights to the customer.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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