| **Consolidated Statements of Cash Flows - USD ($) $ in Millions**                          | 12 Months Ended |
|--------------------------------------------------------------------------------------------|-----------------|
||
| **Cash flows from operating activities:**                                                  |            |   |   |
| Net income                                                                                 | $ 313           | $ 228 | $ 233 |
| **Adjustments to reconcile net income to net cash provided by operating activities:**      |            |   |   |
| Depreciation and amortization                                                              | 496             | 458 | 417 |
| Deferred income taxes                                                                      | 23              | 8 | 6 |
| Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | (23)            | (19) | (14) |
| Pension and other postretirement benefits                                                  | 6               | 5 | 13 |
| Decoupling mechanism deferrals, net of amortization                                        | 40              | (11) | (11) |
| Share-based Payment Arrangement, Noncash Expense                                           | 24              | 17 | 15 |
| Increase (Decrease) in Other Regulatory Assets                                             | (126)           | 20 | (46) |
| Increase (Decrease) in Regulatory Liabilities                                              | (20)            | 24 | 5 |
| Other Operating Activities, Cash Flow Statement                                            | 112             | 24 | 0 |
| Other non-cash income and expenses, net                                                    | 57              | 40 | 40 |
| **Changes in working capital:**                                                            |            |   |   |
| Decrease (increase) in receivables and unbilled revenues                                   | (66)            | (29) | (66) |
| (Increase) in margin deposits                                                              | (33)            | 24 | (80) |
| (Decrease) increase in payables and accrued liabilities                                    | 47              | (166) | 157 |
| Increase (Decrease) in Contract with Customer, Asset                                       | 0               | (135) | 82 |
| Other working capital items, net                                                           | (12)            | (20) | (22) |
| Contribution to non-qualified employee benefit trust                                       | (10)            | (7) | (9) |
| Asset Retirement Obligation, Cash Paid to Settle                                           | (16)            | (25) | (27) |
| Other, net                                                                                 | (34)            | (16) | (19) |
| Net cash provided by operating activities                                                  | 778             | 420 | 674 |
| **Cash flows from investing activities:**                                                  |            |   |   |
| Capital expenditures                                                                       | (1,268)         | (1,358) | (766) |
| Purchases of nuclear decommissioning trust securities                                      | (8)             | (1) | (3) |
| Sales of nuclear decommissioning trust securities                                          | 2               | 1 | 3 |
| Other, net                                                                                 | (23)            | 0 | 8 |
| Net cash used in investing activities                                                      | (1,297)         | (1,358) | (758) |
| **Cash flows from financing activities:**                                                  |            |   |   |
| Proceeds from issuance of long-term debt                                                   | 670             | 600 | 360 |
| Payments on long-term debt                                                                 | (130)           | (260) | 0 |
| Proceeds from Issuance or Sale of Equity                                                   | 346             | 485 | 0 |
| Proceeds from (Repayments of) Commercial Paper                                             | (146)           |   |   |
| Proceeds from Issuance of Commercial Paper                                                 |            | 146 | 0 |
| Proceeds from Other Debt                                                                   | 0               | 0 | 25 |
| Dividends paid                                                                             | (200)           | (179) | (158) |
| Payments for Repurchase of Common Stock                                                    | 0               | 0 | (18) |
| Other                                                                                      | (14)            | (14) | (12) |
| Net cash used in financing activities                                                      | 526             | 778 | 197 |
| (Decrease) increase in cash and cash equivalents                                           | 7               | (160) | 113 |
| Cash and cash equivalents, beginning of year                                               | 5               | 165 | 52 |
| Cash and cash equivalents, end of year                                                     | 12              | 5 | 165 |
| **Supplemental disclosures of cash flow information:**                                     |            |   |   |
| Cash paid for interest, net of amounts capitalized                                         | 174             | 136 | 128 |
| Proceeds from Income Tax Refunds                                                           | (90)            |   |   |
| Cash paid for income taxes                                                                 |            | 12 | 37 |
| **Non-cash investing and financing activities:**                                           |            |   |   |
| Accrued capital additions                                                                  | 184             | 212 | 111 |
| Accrued dividends payable                                                                  | $ 57            | $ 51 | $ 42 |

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| - Definition
The deferral, which can be either a positive or negaitive amount depending on whether a collection from or refund to customers results, of the amounts recorded in net income for energy useage by customers on a weather adjusted basis that is different from base rates as determined under the Company's decoupling mechanism, expected to be recovered or refunded in future periods.
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Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows.
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Future cash outflow to pay for purchases of fixed assets that have occurred.
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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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| - Definition
Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.
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Amount, before refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.
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| - Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.
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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.
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The increase (decrease) during the reporting period in the obligation created by employee agreements whereby earned compensation will be paid in the future.
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The increase (decrease) during the reporting period in money or securities placed with a broker or counterparty as security for a trading or derivative position.
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Amount of increase (decrease) in operating assets classified as other.
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Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other.
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The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet.
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The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.
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The increase (decrease) during the reporting period in regulated liabilities. Regulated liabilities are created when regulatory agency permits an entity to defer revenues to the balance sheet.
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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.
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| - Definition
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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| - Definition
Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
+ References
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| - References
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| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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| - References
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| - Definition
Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.
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| - Definition
Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).
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| - Definition
Amount of cash (inflow) outflow from investing activities classified as other.
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| - Definition
The cash outflow to reacquire common stock during the period.
+ References
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| - Definition
Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.
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| - Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
+ References
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| - Definition
The cash outflow for the purchase of investments that will be held in a decommissioning trust fund.
+ References
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| - Definition
Amount of cost (reversal of cost) for pension and other postretirement benefits.
+ References
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| - Definition
Amount of income tax refund received from tax jurisdiction.
+ References
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| - Definition
The cash inflow from borrowing by issuing commercial paper.
+ References
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| - Definition
The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.
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| - Definition
Amount of cash inflow from debt classified as other.
+ References
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| - Definition
Amount of cash inflow (outflow) from financing activities classified as other.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net cash inflow or cash outflow from issuing (borrowing) and repaying commercial paper.
+ References
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| - Definition
The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.
+ References
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                                                                                                                                                                                                                                                             |
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| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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Amount of noncash expense for share-based payment arrangement.
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