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Debt - Non-Recourse Debt Narrative (Details) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |
Debt defaults at risk of causing cross default |  | 0 |
Gain on extinguishment of debt |  | $ 17,000,000 | $ 4,000,000
Proceeds from Issuance of Debt | $ 75,000,000 |  |
Parent Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Gain on extinguishment of debt |  | (47,000,000) | $ 7,000,000
Nonrecourse Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Gain on extinguishment of debt |  | 64,000,000 |
Issued new debt |  | 637,000,000 |
Repayments of Long-term Debt |  | (414,000,000) |
Nonrecourse Debt [Member] | MCAC - Generation [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Gain on extinguishment of debt |  | 0 |
Issued new debt |  | 107,000,000 |
Repayments of Long-term Debt |  | 0 |
Nonrecourse Debt [Member] | Andes - Generation [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Gain on extinguishment of debt |  | 65,000,000 |
Issued new debt |  | 307,000,000 |
Repayments of Long-term Debt |  | (181,000,000) |
Nonrecourse Debt [Member] | Other Subsidiaries [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Gain on extinguishment of debt |  | (1,000,000) |
Issued new debt |  | 223,000,000 |
Repayments of Long-term Debt |  | (233,000,000) |
7.75% Senior Notes Due 2024 [Member] | Nonrecourse Debt [Member] | Andes - Generation [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued new debt |  | $ 300,000,000 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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