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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 1,448 $ 1,262 $ 1,088
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 1,250 1,156 1,113
Deferred income taxes and investment tax credits 239 146 334
Gains on sale of assets (70) (62) (114)
Loss from plant closure (26) 6 200
Equity earnings (189) (119) (55)
Fixed-price contracts and other derivatives (10) (25) (21)
Other adjustments to reconcile net income to net cash provided by operating activities 75 108 13
Net change in other working capital components [Abstract]      
Net change in accounts and notes receivable (99) 44 (273)
Net change in income taxes, net 39 62 (38)
Net change in inventories 65 (133) 116
Net change in regulatory balancing accounts 586 (317) (198)
Net change in regulatory assets and liabilities (4) 8 1
Net change in other current assets (18) (10) 15
Net change in accounts payable (157) 109 (28)
Net change in reserve for Aliso Canyon costs 274 0 0
Net change in other current liabilities 13 (138) (215)
Net change in other working capital components 699 (375) (620)
Insurance receivable for Aliso Canyon costs (325) 0 0
Changes in other assets (162) 19 (171)
Changes in other liabilities (24) 45 17
Net cash provided by (used in) operating activities 2,905 2,161 1,784
CASH FLOWS FROM INVESTING ACTIVITIES      
Expenditures for property, plant and equipment (3,156) (3,123) (2,572)
Expeditures for investments and acquisition of businesses, net of cash acquired (200) (240) (22)
Proceeds from sale of assets 373 149 570
Proceeds from U.S. Treasury grants 0 0 238
Distributions from investments 15 13 152
Proceeds from sales by nuclear decommissioning and other trusts 577 601 695
Purchases of nuclear decommissioning and other trust assets (531) (613) (697)
Increase in restricted cash (100) (152) (356)
Decrease in restricted cash 93 155 329
Advances to unconsolidated affiliates (31) (185) (14)
Decrease (increase) in notes receivable to unconsolidated affiliates, net 74 18 0
Other cash flows from investing activities 1 35 (12)
Net cash provided by (used in) investing activities (2,885) (3,342) (1,689)
CASH FLOWS FROM FINANCING ACTIVITIES      
Common dividends paid (628) (598) (606)
Redemptions of preferred stock of subsidiary 0 0 (82)
Preferred dividends paid by subsidiaries (1) (1) (5)
Issuances of common stock 52 56 62
Repurchases of common stock (74) (38) (45)
Issuances of debt (maturities greater than 90 days) 2,992 3,272 2,081
Payments on long-term debt (1,854) (2,034) (1,788)
Proceeds from sale of noncontrolling interest, net of offering costs. 0 0 574
Increase (decrease) in short-term debt, net (622) 412 256
Purchase of noncontrolling interests 0 (74) 0
Distributions to noncontrolling interests (73) (104) (69)
Excess Tax Benefit From Share Based Compensation Financing Activities 52 0 0
Other cash flows from financing activities (17) (37) (40)
Net cash provided by (used in) financing activities (173) 854 338
Effect of exchange rate changes on cash and cash equivalents (14) (7) (4)
Increase (decrease) in cash and cash equivalents (167) (334) 429
Cash and cash equivalents, beginning of period 570 [1] 904 475
Cash and cash equivalents, end of period 403 570 [1] 904
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION      
Interest payments, net of amounts capitalized 537 536 544
Income tax payments, net of refunds 67 102 120
Acquisition Of Business [Abstract]      
Assets acquired 10 0 13
Accrued purchase price (5) 0 0
Liabilities assumed (2) 0 (2)
Cash paid 3 0 11
Nuclear facility plant reclassified to regulatory asset, net of depreciation and amortization 0 0 512
Accrued capital expenditures 566 433 437
Increase in capital lease obligations for investment in property, plant and equipment 24 60 0
Financing of build-to-suit property 61 61 14
Capital expenditures recoverable by U. S. Treasury grants receivable 0 0 3
Sequestration of U.S. Treasury grants receivable 0 0 (23)
Redemption of industrial development bonds 79 0 0
Common Stock Issued Employee Stock Trust 55 42 0
Dividends declared but not paid 180 166 157
San Diego Gas and Electric Company [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income 606 527 435
Adjustments to reconcile net income to net cash provided by operating activities:      
Utility depreciation and amortization 604 530 494
Deferred income taxes and investment tax credits 195 223 171
Adjustment To Utility Loss From Plant Closure (26) 6 200
Fixed-price contracts and other derivatives (4) (6) (8)
Other adjustments to reconcile net income to net cash provided by operating activities (16) (23) (37)
Net change in other working capital components [Abstract]      
Net change in accounts and notes receivable (10) (47) (40)
Net change in due to/from affiliates, net 21 (10) 38
Net change in income taxes, net 0 35 (50)
Net change in inventories (2) 4 (14)
Net change in regulatory balancing accounts 474 (208) (140)
Net change in other current assets (24) (16) 7
Net change in accounts payable (28) (23) 50
Net change in interest payable (1) 0 4
Net change in other current liabilities (16) (104) (260)
Net change in other working capital components 414 (369) (405)
Changes in other assets (122) 191 (150)
Changes in other liabilities 13 18 19
Net cash provided by (used in) operating activities 1,664 1,097 719
CASH FLOWS FROM INVESTING ACTIVITIES      
Expenditures for property, plant and equipment (1,133) (1,100) (978)
Proceeds from sale of assets 0 0 11
Proceeds from sales by nuclear decommissioning trusts 577 601 685
Purchases of nuclear decommissioning trust assets (526) (609) (692)
Increase in restricted cash (39) (84) (81)
Decrease in restricted cash 35 96 82
Other cash flows from investing activities 0 (30) 0
Net cash provided by (used in) investing activities (1,086) (1,126) (973)
CASH FLOWS FROM FINANCING ACTIVITIES      
Common dividends paid (300) (200) 0
Preferred dividends paid 0 0 (5)
Redemptions of preferred stock of subsidiary 0 0 (82)
Issuances of long-term debt 444 100 450
Payments on long-term debt (547) (24) (199)
Increase (decrease) in short-term debt, net (131) 187 59
Distributions to noncontrolling interests (30) (53) (26)
Other cash flows from financing activities (2) 0 (3)
Net cash provided by (used in) financing activities (566) 10 194
Increase (decrease) in cash and cash equivalents 12 (19) (60)
Cash and cash equivalents, beginning of period 8 [2] 27 87
Cash and cash equivalents, end of period 20 8 [2] 27
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION      
Interest payments, net of amounts capitalized 199 196 187
Income tax payments, net of refunds 88 (4) 84
Acquisition Of Business [Abstract]      
Nuclear facility plant reclassified to regulatory asset, net of depreciation and amortization 0 0 512
Accrued capital expenditures 191 217 182
Increase in capital lease obligations for investment in property, plant and equipment 15 60 0
Southern California Gas Company [Member]      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income 420 333 365
Adjustments to reconcile net income to net cash provided by operating activities:      
Utility depreciation and amortization 461 431 383
Deferred income taxes and investment tax credits 127 130 117
Other adjustments to reconcile net income to net cash provided by operating activities (11) (7) (5)
Net change in other working capital components [Abstract]      
Net change in accounts and notes receivable (90) 30 (113)
Net change in due to/from affiliates, net (11) (1) (57)
Net change in income taxes, net 8 17 51
Net change in inventories 102 (113) 82
Net change in regulatory balancing accounts 112 (109) (58)
Net change in other current assets 8 (3) 3
Net change in accounts payable (143) 156 (54)
Net change in customer deposits 1 0 (1)
Net change in reserve for Aliso Canyon costs 274 0 0
Net change in other current liabilities 45 3 24
Net change in other working capital components 306 (20) (123)
Insurance receivable for Aliso Canyon costs (325) 0 0
Changes in other assets (91) (131) (52)
Changes in other liabilities (7) 29 (4)
Net cash provided by (used in) operating activities 880 765 681
CASH FLOWS FROM INVESTING ACTIVITIES      
Expenditures for property, plant and equipment (1,352) (1,104) (762)
Decrease (increase) in notes receivable to unconsolidated affiliates, net (50) 0 34
Net cash provided by (used in) investing activities (1,402) (1,104) (728)
CASH FLOWS FROM FINANCING ACTIVITIES      
Common dividends paid (50) (100) (50)
Preferred dividends paid (1) (1) (1)
Issuances of long-term debt 599 747 0
Payments on long-term debt 0 (250) 0
Increase (decrease) in short-term debt, net (50) 8 42
Debt issuance costs (3) (7) 0
Net cash provided by (used in) financing activities 495 397 (9)
Increase (decrease) in cash and cash equivalents (27) 58 (56)
Cash and cash equivalents, beginning of period 85 [1] 27 83
Cash and cash equivalents, end of period 58 85 [1] 27
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION      
Interest payments, net of amounts capitalized 79 62 65
Income tax payments, net of refunds 1 (10) (52)
Acquisition Of Business [Abstract]      
Accrued capital expenditures $ 189 $ 168 $ 130
[1] As adjusted for the retrospective adoption of ASU 2015-03.
[2] As adjusted for the retrospective adoption of ASU 2015-03.