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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 2,217 | $ 2,483 | $ 4,555 | $ 5,133
Regulated Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 610 | 706 | 1,313 | 1,484
Other non-606 revenue |  | 14 | 18 | 23 | 25
Revenue |  | 624 | 724 | 1,336 | 1,509
Non-regulated revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 1,419 | 1,598 | 2,870 | 3,310
Other non-606 revenue | [1] | 174 | 161 | 349 | 314
Revenue |  | 1,593 | 1,759 | 3,219 | 3,624
US and Utilities [Domain] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 913 | 976 | 1,884 | 1,995
US and Utilities [Domain] | Regulated Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 610 | 706 | 1,313 | 1,484
Other non-606 revenue |  | 14 | 18 | 23 | 25
Revenue |  | 624 | 724 | 1,336 | 1,509
US and Utilities [Domain] | Non-regulated revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 201 | 180 | 364 | 353
Other non-606 revenue | [1] | 88 | 72 | 184 | 133
Revenue |  | 289 | 252 | 548 | 486
South America [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 711 | 765 | 1,423 | 1,610
South America [Member] | Regulated Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 0 | 0 | 0 | 0
Other non-606 revenue |  | 0 | 0 | 0 | 0
Revenue |  | 0 | 0 | 0 | 0
South America [Member] | Non-regulated revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 708 | 764 | 1,419 | 1,607
Other non-606 revenue | [1] | 3 | 1 | 4 | 3
Revenue |  | 711 | 765 | 1,423 | 1,610
MCAC [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 381 | 478 | 813 | 928
MCAC [Member] | Regulated Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 0 | 0 | 0 | 0
Other non-606 revenue |  | 0 | 0 | 0 | 0
Revenue |  | 0 | 0 | 0 | 0
MCAC [Member] | Non-regulated revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 356 | 455 | 764 | 884
Other non-606 revenue | [1] | 25 | 23 | 49 | 44
Revenue |  | 381 | 478 | 813 | 928
Eurasia - Generation [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | 214 | 265 | 439 | 604
Eurasia - Generation [Member] | Regulated Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 0 | 0 | 0 | 0
Other non-606 revenue |  | 0 | 0 | 0 | 0
Revenue |  | 0 | 0 | 0 | 0
Eurasia - Generation [Member] | Non-regulated revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 156 | 201 | 327 | 468
Other non-606 revenue | [1] | 58 | 64 | 112 | 136
Revenue |  | 214 | 265 | 439 | 604
Corporate Other And Other Eliminations [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue |  | (2) | (1) | (4) | (4)
Corporate Other And Other Eliminations [Member] | Regulated Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 0 | 0 | 0 | 0
Other non-606 revenue |  | 0 | 0 | 0 | 0
Revenue |  | 0 | 0 | 0 | 0
Corporate Other And Other Eliminations [Member] | Non-regulated revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | (2) | (2) | (4) | (2)
Other non-606 revenue | [1] | 0 | 1 | 0 | (2)
Revenue |  | $ (2) | $ (1) | $ (4) | $ (4)
[1] | Other non-regulated revenue primarily includes lease and derivative revenue not accounted for under ASC 606.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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