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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 778 $ 558
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 610 574
Deferred income taxes and investment tax credits 203 105
Gain on sale of equity interest and assets (62) (29)
Plant closure (adjustment) loss (21) (13)
Equity earnings (83) (55)
Fixed-price contracts and other derivatives 0 (17)
Other (8) (6)
Net change in other working capital components (116) (125)
Changes in other assets (89) 21
Changes in other liabilities 7 21
Net cash provided by operating activities 1,219 1,034
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (1,466) (1,513)
Expenditures for investments (161) (160)
Proceeds from sale of equity interest and assets, net of cash sold 347 66
Distributions from investments 9 6
Purchases of nuclear decommissioning and other trust assets (229) (356)
Proceeds from sales by nuclear decommissioning and other trusts 221 350
Decrease in restricted cash 49 87
Increase in restricted cash (34) (87)
Advances to unconsolidated affiliates (20) (24)
Proceeds From Payments For Long Term Loans For Related Parties 74 0
Other cash flows from investing activities 9 10
Net cash used in investing activities (1,201) (1,621)
CASH FLOWS FROM FINANCING ACTIVITIES    
Common dividends paid (308) (301)
Preferred dividends paid by subsidiaries (1) (1)
Proceeds from issuances of common stock 31 28
Repurchases of common stock (66) (37)
Issuances of long-term debt 1,547 2,345
Payments on long-term debt (846) (1,475)
Increase (decrease) in short-term debt, net (339) (54)
Distributions to noncontrolling interests (14) (23)
Other cash flows from financing activities 46 (10)
Net cash provided by (used in) financing activities 50 472
Effect of exchange rate changes on cash and cash equivalents (2) 0
Increase (decrease) in cash and cash equivalents 66 (115)
Cash and cash equivalents, beginning of period 570 [1] 904
Cash and cash equivalents, end of period 636 789
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 260 269
Income tax payments, net of refunds 72 148
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Accrued capital expenditures 302 287
Increase in capital lease obligations for investments in property, plant and equipment 0 60
Acquisition Of Business [Abstract]    
Assets acquired 10 0
Accrued purchase price (6) 0
Liabilities Assumed (2) 0
Cash paid 2 0
Dividends declared but not paid 178 165
Financing of build-to-suit property 39 32
Redemption of industrial development bonds 79 0
San Diego Gas and Electric Company [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income 281 230
Adjustments to reconcile net income to net cash provided by operating activities:    
Utility depreciation and amortization 294 261
Deferred income taxes and investment tax credits 103 132
Utility plant closure (adjustment) loss (21) (13)
Fixed-price contracts and other derivatives (2) (3)
Other (9) (24)
Net change in other working capital components (40) (231)
Changes in other assets (59) 37
Changes in other liabilities 3 19
Net cash provided by operating activities 550 408
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (600) (543)
Purchases of nuclear decommissioning trust assets (227) (354)
Proceeds from sales by nuclear decommissioning trusts 221 350
Decrease in restricted cash 19 62
Increase in restricted cash (19) (64)
Net cash used in investing activities (606) (549)
CASH FLOWS FROM FINANCING ACTIVITIES    
Issuances of long-term debt 388 100
Payments on long-term debt (105) (20)
Increase (decrease) in short-term debt, net (206) 68
Distributions to noncontrolling interests (6) (13)
Net cash provided by (used in) financing activities 71 135
Increase (decrease) in cash and cash equivalents 15 (6)
Cash and cash equivalents, beginning of period 8 [1] 27
Cash and cash equivalents, end of period 23 21
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 99 98
Income tax payments, net of refunds 99 12
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Accrued capital expenditures 118 103
Increase in capital lease obligations for investments in property, plant and equipment 0 60
Southern California Gas Company [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income 285 159
Adjustments to reconcile net income to net cash provided by operating activities:    
Utility depreciation and amortization 226 212
Deferred income taxes and investment tax credits 76 59
Other (15) (2)
Net change in other working capital components (58) 61
Changes in other assets (30) (27)
Changes in other liabilities (1) 1
Net cash provided by operating activities 483 463
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (603) (500)
Advances to unconsolidated affiliates (279) 0
Net cash used in investing activities (882) (500)
CASH FLOWS FROM FINANCING ACTIVITIES    
Preferred dividends paid (1) (1)
Issuances of long-term debt 599 248
Payments on long-term debt 0 (250)
Increase (decrease) in short-term debt, net (50) 31
Other cash flows from financing activities (3) (2)
Net cash provided by (used in) financing activities 545 26
Increase (decrease) in cash and cash equivalents 146 (11)
Cash and cash equivalents, beginning of period 85 [1] 27
Cash and cash equivalents, end of period 231 16
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 36 32
Income tax payments, net of refunds 14 19
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Accrued capital expenditures $ 143 $ 102
[1] Derived from audited financial statements.