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ACQUISTION AND DIVESTITURE ACTIVITY - Sempra South American Utilities (Details) $ in Millions | Dec. 31, 2018 USD ($) | Dec. 18, 2018 USD ($) kv
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Compania Transmisora del Norte Grande S.A. [Member] |  |
Business Acquisition [Line Items] |  |
Consideration transferred |  | $ 226
Cash and cash equivalents |  | 18
Revenue since date of acquisition | $ 1 |
Compania Transmisora del Norte Grande S.A. [Member] |  |
Business Acquisition [Line Items] |  |
Consideration transferred |  | 226
Cash consideration (fair value of total consideration) |  | 208
Cash and cash equivalents |  | $ 18
Compania Transmisora del Norte Grande S.A. [Member] | Sempra South American Utilities [Member] | Compania Transmisora del Norte Grande S.A. [Member] |  |
Business Acquisition [Line Items] |  |
Acquired percentage interest |  | 100.00%
Single-circuit Transmission Line [Member] | Sempra South American Utilities [Member] | Companía Transmisora del Norte Grande S.A. [Member] |  |
Business Acquisition [Line Items] |  |
Energy transmission voltage | kv |  | 110
Double-circuit Transmission Line [Member] | Sempra South American Utilities [Member] | Companía Transmisora del Norte Grande S.A. [Member] |  |
Business Acquisition [Line Items] |  |
Energy transmission voltage | kv |  | 220

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