v3.6.0.2

INCOME TAXES - UNRECOGNIZED TAX BENEFITS (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Unrecognized deferred tax liability related to basis difference and consisting of cumulative undistributed earnings |  |  |  | $ 4,600 |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits | $ 87 | $ 117 | $ 90 | 90 | $ 87 | $ 117
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate |  |  |  | (87) | (83) | (114)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate |  |  |  | 36 | 32 | 21
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |
Beginning balance | 87 | 117 | 90 |  |  |
Increase in prior period tax positions | 2 | 10 | 37 |  |  |
Decrease in prior period tax positions | (2) | 0 | 0 |  |  |
Increase in current period tax positions | 6 | 8 | 5 |  |  |
Settlements with taxing authorities | (3) | (48) | (15) |  |  |
Ending balance | 90 | 87 | 117 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract] |  |  |  |  |  |
Interest (income) expense | 0 | (2) | (4) |  |  |
Penalties | 0 | 0 | (3) |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] |  |  |  |  |  |
Accrued interest |  |  |  | 1 | 1 |
Accrued penalties |  |  |  | 0 | 0 |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits | 20 | 14 | 17 | 22 | 20 | 14
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate |  |  |  | (19) | (16) | (11)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate |  |  |  | 13 | 11 | 6
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |
Beginning balance | 20 | 14 | 17 |  |  |
Increase in prior period tax positions | 0 | 5 | 2 |  |  |
Increase in current period tax positions | 2 | 2 | 0 |  |  |
Settlements with taxing authorities | 0 | (1) | (5) |  |  |
Ending balance | 22 | 20 | 14 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract] |  |  |  |  |  |
Interest (income) expense | 0 | 0 | (1) |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] |  |  |  |  |  |
Accrued interest |  |  |  | 0 | 0 |
Southern California Gas Company [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized tax benefits | 27 | 19 | 13 | 29 | 27 | 19
Of the total, amounts related to tax positions that, if recognized, in future years, would decrease the effective tax rate |  |  |  | (29) | (27) | (19)
Of the total, amounts related to tax positions that, if recognized, in future years, would increase the effective tax rate |  |  |  | $ 24 | $ 21 | $ 15
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |
Beginning balance | 27 | 19 | 13 |  |  |
Increase in prior period tax positions | 0 | 2 | 2 |  |  |
Decrease in prior period tax positions | (2) | 0 | 0 |  |  |
Increase in current period tax positions | 4 | 6 | 4 |  |  |
Ending balance | $ 29 | $ 27 | $ 19 |  |  |

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