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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 1,110 $ 1,060
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 970 925
Deferred income taxes and investment tax credits 170 179
Impairment losses 154 0
Plant closure adjustment 0 (21)
Gain on sale of assets (131) (62)
Equity earnings (73) (143)
Remeasurement of equity method investment (617) 0
Fixed-price contracts and other derivatives 39 (20)
Other 50 28
Net change in other working capital components 224 260
Insurance receivable for Aliso Canyon costs (339) 0
Changes in other assets (4) (112)
Changes in other liabilities 138 (5)
Net cash provided by operating activities 1,691 2,089
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (3,087) (2,227)
Expenditures for investments and acquisition of businesses, net of cash and cash equivalents acquired (1,212) (183)
Proceeds from sale of assets, net of cash sold 761 347
Distributions from investments 23 14
Purchases of nuclear decommissioning and other trust assets (418) (407)
Proceeds from sales by nuclear decommissioning and other trusts 486 431
Increases in restricted cash (53) (81)
Decreases in restricted cash 71 68
Advances to unconsolidated affiliates (12) (24)
Repayments of advances to unconsolidated affiliates 11 74
Other (2) 9
Net cash used in investing activities (3,432) (1,979)
CASH FLOWS FROM FINANCING ACTIVITIES    
Common dividends paid (510) (468)
Preferred dividends paid by subsidiary (1) (1)
Issuances of common stock 40 41
Repurchases of common stock (55) (74)
Issuances of debt (maturities greater than 90 days) 2,013 2,058
Payments on debt (maturities greater than 90 days) (1,298) (1,316)
Increase (decrease) in short-term debt, net 1,636 (201)
Deposit for sale of noncontrolling interest 78 0
Net distributions to noncontrolling interests (43) (57)
Tax benefit related to share-based compensation 0 56
Other (12) (9)
Net cash provided by financing activities 1,848 29
Effect of exchange rate changes on cash and cash equivalents 8 (12)
Increase (decrease) in cash and cash equivalents 115 127
Cash and cash equivalents, January 1 403 [1] 570
Cash and cash equivalents, September 30 518 697
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 367 355
Income tax payments, net of refunds 103 37
Supplemental disclosure of noncash investing and financing activities:    
Assets acquired, net of cash and cash equivalents (2,692) (10)
Fair value of equity method investment immediately prior to acquisition (1,144) 0
Liabilities assumed (448) (2)
Accrued purchase price (4) (5)
Cash paid, net of cash and cash equivalents acquired 1,096 3
Accrued capital expenditures 483 459
Financing of build-to-suit property 0 61
Redemption of industrial development bonds 0 79
Common dividends issued in stock 40 41
Dividends declared but not paid 195 179
San Diego Gas and Electric Company [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income 418 463
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 478 446
Deferred income taxes and investment tax credits 98 170
Plant closure adjustment 0 (21)
Fixed-price contracts and other derivatives (2) (3)
Other (29) (14)
Net change in other working capital components 14 136
Changes in other assets (47) (93)
Changes in other liabilities 3 10
Net cash provided by operating activities 933 1,094
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (959) (835)
Purchases of nuclear decommissioning trust assets (415) (404)
Proceeds from sales by nuclear decommissioning trusts 486 431
Increases in restricted cash (30) (29)
Decreases in restricted cash 43 27
Increase in loans to affiliate, net (107) 0
Net cash used in investing activities (982) (810)
CASH FLOWS FROM FINANCING ACTIVITIES    
Common dividends paid (175) (150)
Issuances of debt (maturities greater than 90 days) 498 388
Payments on debt (maturities greater than 90 days) (148) (294)
Increase (decrease) in short-term debt, net (114) (202)
Net distributions to noncontrolling interests (6) (14)
Other (3) 0
Net cash provided by financing activities 52 (272)
Increase (decrease) in cash and cash equivalents 3 12
Cash and cash equivalents, January 1 20 [1] 8
Cash and cash equivalents, September 30 23 20
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 132 141
Income tax payments, net of refunds 165 62
Supplemental disclosure of noncash investing and financing activities:    
Accrued capital expenditures 139 142
Southern California Gas Company [Member]    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income 199 277
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 355 342
Deferred income taxes and investment tax credits 52 98
Impairment losses 23 0
Other (22) (18)
Net change in other working capital components 135 48
Insurance receivable for Aliso Canyon costs (339) 0
Changes in other assets 2 (57)
Changes in other liabilities 4 0
Net cash provided by operating activities 409 690
CASH FLOWS FROM INVESTING ACTIVITIES    
Expenditures for property, plant and equipment (949) (946)
Increase in loans to affiliate, net (1) (250)
Net cash used in investing activities (950) (1,196)
CASH FLOWS FROM FINANCING ACTIVITIES    
Preferred dividends paid (1) (1)
Issuances of debt (maturities greater than 90 days) 499 599
Payments on debt (maturities greater than 90 days) (3) 0
Increase (decrease) in short-term debt, net 0 (50)
Other (4) (4)
Net cash provided by financing activities 491 544
Increase (decrease) in cash and cash equivalents (50) 38
Cash and cash equivalents, January 1 58 [1] 85
Cash and cash equivalents, September 30 8 123
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Interest payments, net of amounts capitalized 60 53
Income tax payments, net of refunds 35 11
Supplemental disclosure of noncash investing and financing activities:    
Accrued capital expenditures 150 172
Dividends declared but not paid $ 0 $ 50
[1] Derived from audited financial statements.