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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 357 $ 778
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 642 610
Deferred income taxes and investment tax credits (42) 203
Gain on sale of equity interest and assets 0 (62)
Plant closure adjustment 0 (21)
Equity earnings (42) (83)
Fixed-price contracts and other derivatives 41 0
Other 33 (8)
Net change in other working capital components 167 (116)
Insurance Receivable For Aliso Canyon Costs (354) 0
Changes in other assets (67) (89)
Changes in other liabilities 147 7
Net cash provided by operating activities 882 1,219
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (2,006) (1,466)
Expenditures for investments (46) (161)
Proceeds from sale of assets 443 347
Distributions from investments 12 9
Purchases of nuclear decommissioning and other trust assets (206) (229)
Proceeds from sales by nuclear decommissioning and other trusts 204 221
Decrease in restricted cash 44 49
Increase in restricted cash (32) (34)
Advances to unconsolidated affiliates (9) (20)
Proceeds From Payments For Long Term Loans For Related Parties 9 74
Other cash flows from investing activities (6) 9
Net cash used in investing activities (1,593) (1,201)
CASH FLOWS FROM FINANCING ACTIVITIES    
Common dividends paid (335) (308)
Preferred dividends paid by subsidiaries (1) (1)
Proceeds from issuances of common stock 29 31
Repurchases of common stock (54) (66)
Issuances of long-term debt 1,384 1,547
Payments on long-term debt (986) (846)
Increase (decrease) in short-term debt, net 865 (339)
Distributions to noncontrolling interests (10) (14)
Excess Tax Benefit From Share Based Compensation Financing Activities 34 52
Other cash flows from financing activities (10) (6)
Net cash provided by (used in) financing activities 916 50
Effect of exchange rate changes on cash and cash equivalents 8 (2)
Increase (decrease) in cash and cash equivalents 213 66
Cash and cash equivalents, beginning of period 403 [1] 570
Cash and cash equivalents, end of period 616 636
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 279 260
Income tax payments, net of refunds 73 72
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Accrued capital expenditures 541 302
Redemption of industrial development bonds 0 79
Financing of build-to-suit property 0 39
Common dividends issued in stock 27 27
Dividends declared but not paid 195 178
Acquisition Of Business [Abstract]    
Assets acquired 0 10
Liabilities Assumed 0 (2)
Accrued purchase price 0 (6)
Cash paid 0 2
San Diego Gas and Electric Company [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income 217 281
Adjustments to reconcile net income to net cash provided by operating activities:    
Utility depreciation and amortization 317 294
Deferred income taxes and investment tax credits 26 103
Utility plant closure adjustment 0 (21)
Fixed-price contracts and other derivatives (1) (2)
Other (21) (9)
Net change in other working capital components 0 (40)
Changes in other assets (39) (59)
Changes in other liabilities 9 3
Net cash provided by operating activities 508 550
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (602) (600)
Purchases of nuclear decommissioning trust assets (203) (227)
Proceeds from sales by nuclear decommissioning trusts 204 221
Decrease in restricted cash 24 19
Increase in restricted cash (21) (19)
Increase (Decrease) in loans to affiliates, net (172) 0
Net cash used in investing activities (770) (606)
CASH FLOWS FROM FINANCING ACTIVITIES    
Issuances of long-term debt 498 388
Payments on long-term debt (128) (105)
Increase (decrease) in short-term debt, net (114) (206)
Distributions to noncontrolling interests (3) (6)
Other cash flows from financing activities (3) 0
Net cash provided by (used in) financing activities 250 71
Increase (decrease) in cash and cash equivalents (12) 15
Cash and cash equivalents, beginning of period 20 [1] 8
Cash and cash equivalents, end of period 8 23
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 92 99
Income tax payments, net of refunds 125 99
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Accrued capital expenditures 124 118
Dividends declared but not paid 175 0
Southern California Gas Company [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income 195 285
Adjustments to reconcile net income to net cash provided by operating activities:    
Utility depreciation and amortization 234 226
Deferred income taxes and investment tax credits 32 76
Other 7 (15)
Net change in other working capital components 190 (58)
Insurance Receivable For Aliso Canyon Costs (354) 0
Changes in other assets (54) (30)
Changes in other liabilities 12 (1)
Net cash provided by operating activities 262 483
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (650) (603)
Increase (Decrease) in loans to affiliates, net 50 (279)
Net cash used in investing activities (600) (882)
CASH FLOWS FROM FINANCING ACTIVITIES    
Preferred dividends paid (1) (1)
Issuances of long-term debt 499 599
Payments on long-term debt (3) 0
Increase (decrease) in short-term debt, net 0 (50)
Other cash flows from financing activities (4) (3)
Net cash provided by (used in) financing activities 491 545
Increase (decrease) in cash and cash equivalents 153 146
Cash and cash equivalents, beginning of period 58 [1] 85
Cash and cash equivalents, end of period 211 231
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 43 36
Income tax payments, net of refunds 35 14
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES    
Accrued capital expenditures $ 140 $ 143
[1] Derived from audited financial statements.