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CONSOLIDATED BALANCE SHEETS (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current assets:    
Cash and cash equivalents $ 252 [1] $ 912 [1]
Restricted cash 24 [1] 131 [1]
Trade accounts receivable 1,198 [1] 891 [1]
Other accounts and notes receivable 147 [1] 141 [1]
Due from unconsolidated affiliates   34 [1]
Income taxes receivable   257 [1]
Deferred income taxes, net current assets   75 [1]
Inventories 346 [1] 258 [1]
Regulatory balancing accounts - undercollected 38 [1]  
Regulatory Assets, Current 89 [1] 90 [1]
Fixed-price contracts and other derivatives, current assets 85 [1] 81 [1]
Settlement receivable related to wildfire litigation 10 [1] 300 [1]
Other current assets 143 [1] 193 [1]
Total current assets 2,332 [1] 3,363 [1]
Investments And Other Assets [Abstract]    
Restricted cash, noncurrent 22 [1] 27 [1]
Regulatory assets arising from pension and other postretirement benefit obligations 1,126 [1] 869 [1]
Regulatory assets arising from wildfire litigation costs 594 [1] 364 [1]
Regulatory Assets, Noncurrent 1,060 [1] 934 [1]
Nuclear decommissioning trusts 804 [1] 769 [1]
Investment in RBS Sempra Commodities LLP 126 [1] 787 [1]
Other investments 1,545 [1] 2,164 [1]
Goodwill 1,036 [1] 87 [1]
Other intangible assets 448 [1] 453 [1]
Sundry 691 [1] 600 [1]
Total investments and other assets 7,452 [1] 7,054 [1]
Property, plant and equipment:    
Property, Plant and Equipment, Gross 31,192 [1] 27,023 [1]
Less accumulated depreciation and amortization (7,727) [1] (7,209) [1]
Property, plant and equipment, net 23,465 [1] 19,814 [1]
Total assets 33,249 [1] 30,231 [1]
Current liabilities:    
Short-term debt 449 [1] 158 [1]
Accounts payable - trade 983 [1] 755 [1]
Accounts payable - other 124 [1] 109 [1]
Due to unconsolidated affiliates   36 [1]
Income taxes payable 5 [1]  
Deferred income taxes, net current liabilities 173 [1]  
Dividends and interest payable 219 [1] 188 [1]
Regulatory balancing accounts - overcollected 105 [1] 241 [1]
Accrued compensation and benefits 323 [1] 311 [1]
Current portion of long-term debt 336 [1] 349 [1]
Fixed-price contracts and other derivatives, current liabilities 92 [1] 106 [1]
Customer deposits 142 [1] 129 [1]
Reserve for wildfire litigation 586 [1] 639 [1]
Other current liabilities 615 [1] 765 [1]
Total current liabilities 4,152 [1] 3,786 [1]
Long-term debt 10,078 [1] 8,980 [1]
Deferred Credits And Other Liabilities [Abstract]    
Customer advances for construction 142 [1] 154 [1]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent 1,423 [1] 1,105 [1]
Deferred income taxes, net noncurrent liabilities 1,520 [1] 1,545 [1]
Deferred investment tax credits 49 [1] 50 [1]
Regulatory liabilities arising from removal obligations 2,551 [1] 2,630 [1]
Asset retirement obligations 1,905 [1] 1,449 [1]
Regulatory Liability, Noncurrent 87 [1] 138 [1]
Fixed-price contracts and other derivatives, noncurrent liabilities 301 [1] 290 [1]
Deferred credits and other 784 [1] 824 [1]
Total deferred credits and other liabilities 8,762 [1] 8,185 [1]
Contingently redeemable preferred stock of subsidiary 79 [1] 79 [1]
Equity:    
Common stock 2,104 [1] 2,036 [1]
Retained earnings 8,162 [1] 7,292 [1]
Deferred compensation (2) [1] (8) [1]
Accumulated other comprehensive income (loss) (489) [1] (330) [1]
Total shareholders' equity 9,775 [1] 8,990 [1]
Preferred stock of subsidiaries 20 [1] 100 [1]
Other noncontrolling interests 383 [1] 111 [1]
Total equity 10,178 [1] 9,201 [1]
Total liabilities and equity 33,249 [1] 30,231 [1]
San Diego Gas and Electric Company and Subsidiary [Member]
    
Current assets:    
Cash and cash equivalents 29 127
Restricted cash 21 116
Trade accounts receivable 267 248
Other accounts and notes receivable 23 59
Due from unconsolidated affiliates 67 12
Income taxes receivable 102 37
Deferred income taxes, net current assets   129
Inventories 82 71
Regulatory balancing accounts - undercollected 38  
Regulatory assets arising from fixed-price contracts and other derivatives - current 67 66
Regulatory Assets, Current 11 5
Fixed-price contracts and other derivatives, current assets 27 28
Settlement receivable related to wildfire litigation 10 300
Other current assets 51 50
Total current assets 795 1,248
Investments And Other Assets [Abstract]    
Restricted cash, noncurrent 22  
Deferred taxes recoverable in rates 570 502
Regulatory assets arising from fixed-price contracts and other derivatives - noncurrent 191 233
Regulatory assets arising from pension and other postretirement benefit obligations 309 279
Regulatory assets arising from wildfire litigation costs 594 364
Regulatory Assets, Noncurrent 160 73
Nuclear decommissioning trusts 804 769
Sundry 70 56
Total investments and other assets 2,720 2,276
Property, plant and equipment:    
Property, Plant and Equipment, Gross 13,003 11,247
Less accumulated depreciation and amortization (2,963) (2,694)
Property, plant and equipment, net 10,040 8,553
Total assets 13,555 12,077
Current liabilities:    
Accounts payable - trade 375 292
Due to unconsolidated affiliates 14 16
Deferred income taxes, net current liabilities 62  
Accrued compensation and benefits 124 115
Regulatory balancing accounts, net   61
Current portion of long-term debt 19 19
Fixed-price contracts and other derivatives, current liabilities 55 51
Customer deposits 62 54
Reserve for wildfire litigation 586 639
Other current liabilities 139 136
Total current liabilities 1,436 1,383
Long-term debt 4,058 3,479
Deferred Credits And Other Liabilities [Abstract]    
Customer advances for construction 20 21
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent 342 309
Deferred income taxes, net noncurrent liabilities 1,167 1,001
Deferred investment tax credits 26 25
Regulatory liabilities arising from removal obligations 1,462 1,409
Asset retirement obligations 693 619
Fixed-price contracts and other derivatives, noncurrent liabilities 243 248
Deferred credits and other 188 283
Total deferred credits and other liabilities 4,141 3,915
Contingently redeemable preferred stock 79 79
Equity:    
Common stock 1,338 1,138
Retained earnings 2,411 1,980
Accumulated other comprehensive income (loss) (10) (10)
Total shareholders' equity 3,739 3,108
Other noncontrolling interests 102 113
Total equity 3,841 3,221
Total liabilities and equity 13,555 12,077
Southern California Gas Company [Member]
    
Current assets:    
Cash and cash equivalents 36 417
Trade accounts receivable 578 534
Other accounts and notes receivable 63 49
Due from unconsolidated affiliates 40 63
Income taxes receivable 17 28
Inventories 151 105
Regulatory Assets, Current 9 12
Other current assets 28 39
Total current assets 922 1,247
Investments And Other Assets [Abstract]    
Regulatory assets arising from pension and other postretirement benefit obligations 808 586
Regulatory Assets, Noncurrent 137 123
Sundry 8 8
Total investments and other assets 953 717
Property, plant and equipment:    
Property, Plant and Equipment, Gross 10,565 9,824
Less accumulated depreciation and amortization (3,965) (3,802)
Property, plant and equipment, net 6,600 6,022
Total assets 8,475 7,986
Current liabilities:    
Accounts payable - trade 315 327
Accounts payable - other 78 79
Due to unconsolidated affiliates 2 11
Deferred income taxes, net current liabilities 44 17
Accrued compensation and benefits 99 98
Regulatory balancing accounts, net 105 180
Current portion of long-term debt 257 262
Customer deposits 75 73
Other current liabilities 172 163
Total current liabilities 1,147 1,210
Long-term debt 1,064 1,320
Deferred Credits And Other Liabilities [Abstract]    
Customer advances for construction 110 133
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent 833 613
Deferred income taxes, net noncurrent liabilities 576 418
Deferred investment tax credits 23 25
Regulatory liabilities arising from removal obligations 1,075 1,208
Asset retirement obligations 1,161 788
Deferred taxes refundable in rates 87 138
Deferred credits and other 206 178
Total deferred credits and other liabilities 4,071 3,501
Equity:    
Preferred stock 22 22
Common stock 866 866
Retained earnings 1,326 1,089
Accumulated other comprehensive income (loss) (21) (22)
Total shareholders' equity 2,193 1,955
Total equity 2,193 1,955
Total liabilities and equity $ 8,475 $ 7,986
[1] As adjusted for the retrospective effect of a change in accounting principle as we discuss in Note 1.