Energy Transmission Voltage

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ACQUISTION AND DIVESTITURE ACTIVITY - Sempra South American Utilities (Details) $ in Millions	Dec. 31, 2018 USD ($)	Dec. 18, 2018 USD ($) kv
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