ACQUISITION AND DIVESTITURE ACTIVITY - ASSETS ACQUIRED AND LIBILITIES ASSUMED (Details) - USD ($) $ in Millions		9 Months Ended
	Sep. 26, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Fair value of equity interest in GdC immediately prior to acquisition		$ 1,144	$ 0
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill		2,150		$ 819	[1]
Sempra Mexico [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill		$ 1,400		$ 25
Sempra Mexico [Member] | GdC [Member]
Business Acquisition [Line Items]
Cash consideration (fair value of total consideration)	$ 1,144
Fair value of equity interest in GdC immediately prior to acquisition	1,144
Total fair value of business combination	2,288
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents	66
Accounts receivable	39
Other current assets	6
Property, plant and equipment	1,248
Other noncurrent assets	1
Accounts payable	(11)
Due to unconsolidated affiliates	(3)
Current portion of long-term debt	(49)
Fixed-price contracts and other derivatives, current	(6)
Other current liabilities	(20)
Long-term debt	(315)
Asset retirement obligations	(5)
Deferred income taxes	(8)
Fixed-price contracts and other derivatives, noncurrent	(19)
Other noncurrent liabilities	(11)
Total identifiable net assets	913
Goodwill	1,375
Total fair value of business combination	$ 2,288

[1] Derived from audited financial statements.