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Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,560 | $ 2,545 | $ 2,217 | $ 2,338 | $ 2,431 | $ 2,625 | $ 2,483 | $ 2,650 | $ 9,660 |  | $ 10,189 |  | $ 10,736
Loan receivable, net of allowance of $0 | $ 0 |  |  |  | $ 1,351 |  |  |  | 0 |  | 1,351 |  |
Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 2,626 |  | 2,979 |  | 2,885
Other non-606 revenue |  |  |  |  |  |  |  |  | 35 |  | 49 |  | 54
Revenues |  |  |  |  |  |  |  |  | 2,661 |  | 3,028 |  | 2,939
Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 6,418 |  | 6,555 |  | 7,075
Other non-606 revenue |  |  |  |  |  |  |  |  | 581 | [1] | 606 | [1] | 722
Revenues |  |  |  |  |  |  |  |  | 6,999 |  | 7,161 |  | 7,797
US and Utilities [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,918 |  | 4,058 |  | 4,230
US and Utilities [Domain] | Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 2,626 |  | 2,979 |  | 2,885
Other non-606 revenue |  |  |  |  |  |  |  |  | 35 |  | 49 |  | 54
Revenues |  |  |  |  |  |  |  |  | 2,661 |  | 3,028 |  | 2,939
US and Utilities [Domain] | Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 1,015 |  | 767 |  | 972
Other non-606 revenue |  |  |  |  |  |  |  |  | 242 | [1] | 263 | [1] | 319
Revenues |  |  |  |  |  |  |  |  | 1,257 |  | 1,030 |  | 1,291
South America |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,159 |  | 3,208 |  | 3,533
South America | Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Other non-606 revenue |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
South America | Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 3,151 |  | 3,205 |  | 3,529
Other non-606 revenue |  |  |  |  |  |  |  |  | 8 | [1] | 3 | [1] | 4
Revenues |  |  |  |  |  |  |  |  | 3,159 |  | 3,208 |  | 3,533
MCAC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,766 |  | 1,882 |  | 1,728
MCAC [Member] | Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Other non-606 revenue |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
MCAC [Member] | Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 1,668 |  | 1,788 |  | 1,642
Other non-606 revenue |  |  |  |  |  |  |  |  | 98 | [1] | 94 | [1] | 86
Revenues |  |  |  |  |  |  |  |  | 1,766 |  | 1,882 |  | 1,728
EURASIA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 828 |  | 1,047 |  | 1,255
EURASIA [Member] | Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Other non-606 revenue |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
EURASIA [Member] | Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 594 |  | 799 |  | 943
Other non-606 revenue |  |  |  |  |  |  |  |  | 234 | [1] | 248 | [1] | 312
Revenues |  |  |  |  |  |  |  |  | 828 |  | 1,047 |  | 1,255
Corporate Other And Other Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (11) |  | (6) |  | (10)
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
Other non-606 revenue |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0
Revenues |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  | (10) |  | (4) |  | (11)
Other non-606 revenue |  |  |  |  |  |  |  |  | (1) | [1] | (2) | [1] | 1
Revenues |  |  |  |  |  |  |  |  | $ (11) |  | $ (6) |  | $ (10)
[1] | Other non-regulated revenue primarily includes lease and derivative revenue not accounted for under ASC 606.

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