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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 18, 2019 | Apr. 09, 2018 | Sep. 30, 2019 | Jul. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 01, 2019 | Mar. 31, 2019
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  | $ 2 |  |  |  |  |  |  |
Revenue |  |  |  |  | $ 2,625 | $ 2,837 | $ 7,758 | $ 8,114 |  |
Operating margin |  |  |  |  | 701 | 671 | 1,789 | 1,927 |  |
Gain (Loss) on Disposition of Business |  |  |  |  | 16 | (21) | 9 | 856 |  |
Equity Method Investment, Realized Gain (Loss) on Disposal (less than) |  |  |  | $ 14 |  |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  |  |  | $ 4 | $ 6 | 3 | 31 |  |
Business Combination, Consideration Transferred |  |  |  | $ 53 |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  | $ 99 |
Minority Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 807 | 734 |  |
Operating margin |  |  |  |  |  |  | 87 | 119 |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | (65) | 36 |  |
Simple Energy [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 35 |  |  |  |  |  |  |  |
sPower [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage Sold | 48.00% |  |  |  |  |  |  |  |  |
Proceeds from Sale of Equity Method Investments | $ 173 |  |  |  |  |  |  |  |  |
Reinvestment of Proceeds from Sale of Equity Method Investments |  |  |  |  |  |  | $ 58 | $ 0 |  |
Gain (Loss) on Disposition of Business | $ 28 |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 26.00% |  |  |  |  |  |  |  |  | 50.00%
Gas Natural del Este [Member] |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received |  |  | $ 55 |  |  |  |  |  |  |

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