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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - FOOTNOTES (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Basis of Presentation
Rabbi trust investment gains		$ 6	$ 12		$ 12
Gain (loss) on settlement		10	(7)		(21)
New Accounting Standards
Deferred income taxes		151	170
Property, plant and equipment, net		36,796	36,503
Other		970	816
Retained earnings		10,104	10,147
Other (expense) income, net		72	233	[1]	138	[1]
Debt Instruments [Abstract]
Current portion of long-term debt		(1,673)	(1,427)
Long-term debt		21,611	16,445
Long-term Debt, Fiscal Year Maturity [Abstract]
2019		1,654
2020		1,619
2021		2,125
2022		682
2023		1,821
Thereafter		14,166
Accounting Standards Update 2017-07 [Member]
New Accounting Standards
Other (expense) income, net			233		138
Accounting Standards Update 2017-07 [Member] | As previously reported [Member]
New Accounting Standards
Other (expense) income, net			254		132
Accounting Standards Update 2017-07 [Member] | Effect of adoption [Member]
New Accounting Standards
Other (expense) income, net			(21)		6
Parent Company [Member]
Basis of Presentation
Rabbi trust investment gains		(6)	56		23
New Accounting Standards
Deferred income taxes		1,554	1,802
Other		527	396
Other long-term liabilities		511	505
Operation and maintenance		(82)	(80)	[1]	(76)	[1]
Other (expense) income, net		(16)	100	[1]	(7)	[1]
Debt Instruments [Abstract]
Gross long-term debt		11,238	6,737
Market value adjustments for interest rate swaps, net		0	(1)
Build-to-suit lease		138	138
Current portion of long-term debt		(1,498)	(500)
Unamortized discount on long-term debt		(38)	(13)
Unamortized debt issuance costs		(55)	(26)
Long-term debt		9,647	6,198
Long-term Debt, Fiscal Year Maturity [Abstract]
2019		1,500
2020		1,400
2021		1,500
2022		500
2023		1,000
Thereafter		5,200
Parent Company [Member] | Other Long-term Debt, Due June 2018 [Member]
Debt Instruments [Abstract]
Gross long-term debt		0	$ 500
Stated percentage rate			6.15%
Parent Company [Member] | Other Long-term Debt, Due February 2019 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	$ 500
Stated percentage rate		9.80%
Parent Company [Member] | Other Long-term Debt, October 2019 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		1.625%
Parent Company [Member] | Other Long Term Debt Due February 2020 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	0
Stated percentage rate		2.40%
Parent Company [Member] | Other Long Term Debt Due March 2020 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		2.40%
Parent Company [Member] | Other Long Term Debt, Due November 2020 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 400	400
Stated percentage rate		2.85%
Parent Company [Member] | Other Long-term Debt, Due January 2021 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 700	0
Stated percentage rate		2.94%
Parent Company [Member] | Other Long Term Debt, Due March 2021 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 850	850
Stated percentage rate		3.24%
Parent Company [Member] | Other Long-term Debt, Due February 2023 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	0
Stated percentage rate		2.90%
Parent Company [Member] | Other Long-term Debt, Due July 2019 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	0
Stated percentage rate		2.69%
Parent Company [Member] | Other Long-term Debt, Due October 2022 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		2.875%
Parent Company [Member] | Other Long-term Debt, Due December 2023 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		4.05%
Parent Company [Member] | Other Long Term Debt Due June 2024 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		3.55%
Parent Company [Member] | Other Long Term Debt Due February 2028 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 1,000	0
Stated percentage rate		3.40%
Parent Company [Member] | Other Long Term Debt Due February 2038 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 1,000	0
Stated percentage rate		3.80%
Parent Company [Member] | Other Long-term Debt, Due November 2025 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 350	350
Stated percentage rate		3.75%
Parent Company [Member] | Other Long Term Debt Due February 2048 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 800	0
Stated percentage rate		4.00%
Parent Company [Member] | Other Long Term Debt Due June 2027 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 750	750
Stated percentage rate		3.25%
Parent Company [Member] | Other Long-term Debt, Due October 2039 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 750	750
Stated percentage rate		6.00%
Parent Company [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Standards
Operation and maintenance			(80)		(76)
Other (expense) income, net			100		(7)
Parent Company [Member] | Accounting Standards Update 2017-07 [Member] | As previously reported [Member]
New Accounting Standards
Operation and maintenance			(87)		(81)
Other (expense) income, net			107		(2)
Parent Company [Member] | Accounting Standards Update 2017-07 [Member] | Effect of adoption [Member]
New Accounting Standards
Operation and maintenance			7		5
Other (expense) income, net			(7)		(5)
Parent Company [Member] | Foreign exchange instruments [Member]
Basis of Presentation
Gain (loss) on settlement		$ 3	50		$ (28)
Sempra Energy [Member]
Debt Instruments [Abstract]
Build-to-suit lease		138	138
Sempra Energy [Member] | Other Long-term Debt, Due June 2018 [Member]
Debt Instruments [Abstract]
Gross long-term debt		0	$ 500
Stated percentage rate			6.15%
Sempra Energy [Member] | Other Long-term Debt, Due February 2019 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	$ 500
Stated percentage rate		9.80%
Sempra Energy [Member] | Other Long-term Debt, October 2019 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		1.625%
Sempra Energy [Member] | Other Long Term Debt Due February 2020 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	0
Sempra Energy [Member] | Other Long Term Debt Due March 2020 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		2.40%
Sempra Energy [Member] | Other Long Term Debt, Due November 2020 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 400	400
Stated percentage rate		2.85%
Sempra Energy [Member] | Other Long-term Debt, Due January 2021 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 700	0
Sempra Energy [Member] | Other Long Term Debt, Due March 2021 [Member]
Debt Instruments [Abstract]
Gross long-term debt		850	850
Sempra Energy [Member] | Other Long-term Debt, Due February 2023 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	0
Stated percentage rate		2.90%
Sempra Energy [Member] | Other Long-term Debt, Due July 2019 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	0
Stated percentage rate		2.69%
Sempra Energy [Member] | Other Long-term Debt, Due October 2022 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		2.875%
Sempra Energy [Member] | Other Long-term Debt, Due December 2023 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		4.05%
Sempra Energy [Member] | Other Long Term Debt Due June 2024 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 500	500
Stated percentage rate		3.55%
Sempra Energy [Member] | Other Long Term Debt Due February 2028 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 1,000	0
Sempra Energy [Member] | Other Long Term Debt Due February 2038 [Member]
Debt Instruments [Abstract]
Gross long-term debt		1,000	0
Sempra Energy [Member] | Other Long-term Debt, Due November 2025 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 350	350
Stated percentage rate		3.75%
Sempra Energy [Member] | Other Long Term Debt Due February 2048 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 800	0
Stated percentage rate		4.00%
Sempra Energy [Member] | Other Long Term Debt Due June 2027 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 750	750
Stated percentage rate		3.25%
Sempra Energy [Member] | Other Long-term Debt, Due October 2039 [Member]
Debt Instruments [Abstract]
Gross long-term debt		$ 750	$ 750
Stated percentage rate		6.00%
Scenario, Forecast [Member] | Accounting Standards Update 2018-02 [Member]
New Accounting Standards
Retained earnings	$ 40
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Standards
Right-of-use assets - operating leases	623
Property, plant and equipment, net	(147)
Other	81
Retained earnings	17
Scenario, Forecast [Member] | Parent Company [Member] | Accounting Standards Update 2018-02 [Member]
New Accounting Standards
Tax Cuts and Jobs Act of 2017, reclassification From AOCI to retained earnings, tax effect	14
Scenario, Forecast [Member] | Parent Company [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Standards
Right-of-use assets - operating leases	191
Deferred income taxes	(3)
Property, plant and equipment, net	(147)
Other	3
Long-term debt	(138)
Other long-term liabilities	159
Retained earnings	$ 17
[1] As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.

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