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SEMPRA ENERGY - SHAREHOLDERS' EQUITY AND EARNINGS PER SHARE SEMPRA ENERGY COMMON STOCK OFFERINGS (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended		6 Months Ended	12 Months Ended
	Feb. 26, 2019	Jul. 13, 2018	Mar. 08, 2018	Jan. 09, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Issuances of common stock, net								$ 2,272	$ 47	$ 51
Common Stock [Member]
Shares issued (in shares)		11,212,500	8,556,630	26,869,158	7,651,671	8,556,630
Public Offering [Member] | Common Stock [Member]
Shares issued (in shares)		9,750,000		23,364,486
Price of shares issued (in dollars per share)		$ 113.75		$ 107.00
Price of shares issued net of underwriting discount (in dollars per share)		$ 111.87		$ 105.07
Over-Allotment Option [Member] | Common Stock [Member]
Shares issued (in shares)		1,462,500		3,504,672
Issuances of common stock, net		$ 164		$ 367
Underwriting discount				$ 8
Settlement of Forward Sale Contracts [Member] | Common Stock [Member]
Issuances of common stock, net			$ 900		$ 800	$ 900
Underwriting discount		$ 3			$ 14	$ 16
Subsequent Event [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member]
Shares issuable under forward contracts	16,906,185
Minimum [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member]
Forward sales price (in usd per share)							$ 104.53
Maximum [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member]
Forward sales price (in usd per share)							$ 105.18

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The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date.

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Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies.

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