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Investments in Unconsolidated Affiliates (Investments in Equity Method Unconsolidated Affiliates) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | $ 1,409 | $ 1,175 | $ 925
Equity in earnings (losses) of unconsolidated affiliates | 83 | 119 | (15)
Electric Utilities and Infrastructure [Member] |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 97 | 89 | 93
Equity in earnings (losses) of unconsolidated affiliates | 6 | 5 | 5
Gas Utilities and Infrastructure [Member] |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 1,003 | 763 | 566
Equity in earnings (losses) of unconsolidated affiliates | 27 | 62 | 19
Commercial Renewables [Member] |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 201 | 190 | 185
Equity in earnings (losses) of unconsolidated affiliates | (1) | (5) | (82)
Other [Member] |  |  |
Investments In Unconsolidated Affiliates [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 108 | 133 | 81
Equity in earnings (losses) of unconsolidated affiliates | $ 51 | $ 57 | $ 43

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