CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net income	$ 295	$ 315
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	466	438
Nuclear fuel amortization	33	31
Deferred income taxes	34	26
Allowance for equity funds used during construction	(23)	(20)
Equity earnings of unconsolidated subsidiaries	(11)	(9)
Dividends from unconsolidated subsidiaries	11	10
Share-based compensation expense	26	19
Changes in operating assets and liabilities:
Accounts receivable	7	(114)
Accrued unbilled revenues	149	92
Inventories	33	84
Other current assets	(31)	(33)
Accounts payable	(201)	4
Net regulatory assets and liabilities	101	153
Other current liabilities	(77)	(36)
Pension and other employee benefit obligations	(157)	(145)
Other, net	14	(22)
Net cash provided by operating activities	669	793
Investing activities
Capital/construction expenditures	(1,607)	(844)
Purchases of investment securities	(835)	(305)
Proceeds from the sale of investment securities	830	300
Other, net	6	(3)
Net cash used in investing activities	(1,606)	(852)
Financing activities
Proceeds from short-term borrowings, net	1,170	214
Proceeds from issuances of long-term debt	0	392
Repayments of long-term debt, including reacquisition premiums	0	(400)
Dividends paid	(204)	(187)
Other, net	(33)	(13)
Net cash provided by financing activities	933	6
Net change in cash, cash equivalents and restricted cash	(4)	(53)
Cash, cash equivalents and restricted cash at beginning of period	248	147
Cash, cash equivalents and restricted cash at end of period	244	94
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(207)	(190)
Cash received (paid) for income taxes, net	0	0
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	284	238
Inventory transfers to property, plant and equipment	33	18
Operating lease right-of-use assets	0	1,659
Allowance for equity funds used during construction	23	20
Issuance of common stock for equity awards	$ 18	$ 17