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Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 2,622 | $ 2,837 | $ 2,537 | $ 2,740 | $ 2,643 | $ 2,693 | $ 2,613 | $ 2,581 | $ 10,736 | $ 10,530 | $ 10,281
Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 2,885 |  |
Other non-606 revenue |  |  |  |  |  |  |  |  |  | 54 |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,939 |  |
Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 7,075 |  |
Other non-606 revenue | [1] |  |  |  |  |  |  |  |  | 722 |  |
Revenues |  |  |  |  |  |  |  |  |  | 7,797 |  |
US and Utilities [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 4,230 |  |
US and Utilities [Domain] | Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 2,885 |  |
Other non-606 revenue |  |  |  |  |  |  |  |  |  | 54 |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,939 |  |
US and Utilities [Domain] | Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 972 |  |
Other non-606 revenue | [1] |  |  |  |  |  |  |  |  | 319 |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,291 |  |
South America [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,533 |  |
South America [Member] | Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Other non-606 revenue |  |  |  |  |  |  |  |  |  | 0 |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 |  |
South America [Member] | Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 3,529 |  |
Other non-606 revenue | [1] |  |  |  |  |  |  |  |  | 4 |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,533 |  |
MCAC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,728 |  |
MCAC [Member] | Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Other non-606 revenue |  |  |  |  |  |  |  |  |  | 0 |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 |  |
MCAC [Member] | Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 1,642 |  |
Other non-606 revenue | [1] |  |  |  |  |  |  |  |  | 86 |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,728 |  |
EURASIA [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,255 |  |
EURASIA [Member] | Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Other non-606 revenue |  |  |  |  |  |  |  |  |  | 0 |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 |  |
EURASIA [Member] | Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 943 |  |
Other non-606 revenue | [1] |  |  |  |  |  |  |  |  | 312 |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,255 |  |
Corporate Other And Other Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (10) |  |
Corporate Other And Other Eliminations [Member] | Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | 0 |  |
Other non-606 revenue |  |  |  |  |  |  |  |  |  | 0 |  |
Revenues |  |  |  |  |  |  |  |  |  | 0 |  |
Corporate Other And Other Eliminations [Member] | Non-regulated revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  |  | (11) |  |
Other non-606 revenue | [1] |  |  |  |  |  |  |  |  | 1 |  |
Revenues |  |  |  |  |  |  |  |  |  | $ (10) |  |
[1] | Other non-regulated revenue primarily includes lease and derivative revenue not accounted for under ASC 606.

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