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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Income $ 700 $ 391 [1],[2]
Earnings / Net Income 700 369 [1]
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 728 642 [1],[2]
Deferred income taxes and investment tax credits 411 (76) [2]
Impairment losses 71 22 [1],[2]
Equity earnings, net (13) (42) [2]
Fixed-price contracts and other derivatives (142) 41 [2]
Other (19) 45 [2]
Net change in other working capital components 138 167 [2]
Insurance receivable for Aliso Canyon costs 52 (354) [2]
Changes in other assets (88) (67) [2]
Changes in other liabilities 51 147 [2]
Net cash provided by operating activities 1,889 916 [2]
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (1,802) (2,006) [2]
Expenditures for investments (97) (46) [2]
Proceeds from sale of assets 4 443 [2]
Distributions from investments 18 12 [2]
Purchases of nuclear decommissioning and other trust assets (823) (206) [2]
Proceeds from sales by nuclear decommissioning and other trusts 823 204 [2]
Increases in restricted cash (194) (32) [2]
Decreases in restricted cash 185 44 [2]
Advances to unconsolidated affiliates (183) (9) [2]
Repayments of advances to unconsolidated affiliates 2 9 [2]
Other 0 (6) [2]
Net cash used in investing activities (2,067) (1,593) [2]
CASH FLOWS FROM FINANCING ACTIVITIES    
Common dividends paid (368) (335) [2]
Preferred dividends paid (1) (1) [2]
Issuances of common stock 28 29 [2]
Repurchases of common stock (14) (54) [2]
Issuances of debt (maturities greater than 90 days) 1,932 1,384 [2]
Payments on debt (maturities greater than 90 days) (1,006) (986) [2]
(Decrease) increase in short-term debt, net (493) 865 [2]
Net distributions to noncontrolling interests (25) (10) [2]
Other (9) (10) [2]
Net cash provided by (used in) financing activities 44 882 [2]
Effect of exchange rate changes on cash and cash equivalents 8 8 [2]
Increase (decrease) in cash and cash equivalents (126) 213 [2]
Cash and cash equivalents, January 1 349 [3] 403 [2]
Cash and cash equivalents, June 30 223 616 [2]
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 301 279 [2]
Income tax payments, net of refunds 109 73 [2]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Accrued capital expenditures 428 541 [2]
Increase in capital lease obligations for investment in property, plant and equipment 502 0 [2]
Equitization of note receivable due from unconsolidated affiliate 19 0 [2]
Common dividends issued in stock 27 27 [2]
Dividends declared but not paid 214 195 [2]
San Diego Gas and Electric Company [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Income 310 224 [1]
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 329 317 [1]
Deferred income taxes and investment tax credits 98 19 [2]
Fixed-price contracts and other derivatives (1) (1) [2]
Other (20) (21) [2]
Net change in other working capital components 6 0 [2]
Changes in other assets (49) (39) [2]
Changes in other liabilities 17 9 [2]
Net cash provided by operating activities 690 508 [2]
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (763) (602) [2]
Purchases of nuclear decommissioning trust assets (823) (203) [2]
Proceeds from sales by nuclear decommissioning trusts 823 204 [2]
Increases in restricted cash (20) (21) [2]
Decreases in restricted cash 18 24 [2]
(Increase) decrease in loans to affiliate, net 31 (172) [2]
Net cash used in investing activities (734) (770) [2]
CASH FLOWS FROM FINANCING ACTIVITIES    
Common dividends paid (175) 0 [2]
Issuances of debt (maturities greater than 90 days) 398 498 [2]
Payments on debt (maturities greater than 90 days) (163) (128) [2]
(Decrease) increase in short-term debt, net 5 (114) [2]
Capital distributions made by VIE, net (13) (3) [2]
Debt issuance costs (4) (3) [2]
Net cash provided by (used in) financing activities 48 250 [2]
Increase (decrease) in cash and cash equivalents 4 (12) [2]
Cash and cash equivalents, January 1 8 [3] 20 [2]
Cash and cash equivalents, June 30 12 8 [2]
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 94 92 [2]
Income tax payments, net of refunds 13 125 [2]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Accrued capital expenditures 152 124 [2]
Increase in capital lease obligations for investment in property, plant and equipment 500 0 [2]
Dividends declared but not paid 0 175 [2]
Southern California Gas Company [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Income 262 199 [2]
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 252 234 [1],[2]
Deferred income taxes and investment tax credits 96 28 [2]
Impairment losses 0 22 [1]
Other (13) (15) [2]
Net change in other working capital components 253 190 [2]
Insurance receivable for Aliso Canyon costs 52 (354) [2]
Changes in other assets (40) (54) [2]
Changes in other liabilities (7) 12 [2]
Net cash provided by operating activities 855 262 [2]
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (682) (650) [2]
(Increase) decrease in loans to affiliate, net (84) 50 [2]
Net cash used in investing activities (766) (600) [2]
CASH FLOWS FROM FINANCING ACTIVITIES    
Preferred dividends paid (1) (1) [2]
Issuances of debt (maturities greater than 90 days) 0 499 [2]
Payments on debt (maturities greater than 90 days) 0 (3) [2]
(Decrease) increase in short-term debt, net (62) 0 [2]
Debt issuance costs 0 (4) [2]
Net cash provided by (used in) financing activities (63) 491 [2]
Increase (decrease) in cash and cash equivalents 26 153 [2]
Cash and cash equivalents, January 1 12 [3] 58 [2]
Cash and cash equivalents, June 30 38 211 [2]
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 49 43 [2]
Income tax payments, net of refunds 22 35 [2]
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Accrued capital expenditures $ 155 $ 140 [2]
[1] As adjusted for the adoption of ASU 2016-09 as of January 1, 2016.
[2] As adjusted for the adoption of ASU 2016-09 as of January 1, 2016.
[3] Derived from audited financial statements.