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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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