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Acquisitions, Discontinued Operations and Dispositions - Dispositions of Majority Interest in EVgo (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 17, 2016 USD ($) charging_station parking_space | Jun. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Loss on sale |  |  | $ (49) | $ (9) | $ 139
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | EVgo |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash consideration | $ 39 |  |  |  |
Cash received | 17 |  |  |  |
Working capital adjustments | 3 |  |  |  |
Capital contributions | 15 |  |  |  |
Future capital contributions | 7 |  |  |  |
Future earnout potential | 70 |  |  |  |
Financial obligations under agreement | $ 103 |  |  |  |
Number of public fast charging Freedom stations | charging_station | 200 |  |  |  |
Number of commercial and multiifamily parking spaces | parking_space | 10,000 |  |  |  |
Loss on sale |  | $ 78 |  |  |
Loss on sale of equity interest |  | $ 27 |  |  |
Remaining obligation | $ 56 |  | $ 6 |  |
Remaining ownership interest |  |  | 23.70% |  |

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