CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net income	$ 1,185	$ 1,080
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,459	1,332
Nuclear fuel amortization	94	89
Deferred income taxes	45	130
Allowance for equity funds used during construction	(91)	(55)
Equity earnings of unconsolidated subsidiaries	(29)	(29)
Dividends from unconsolidated subsidiaries	32	30
Provision for bad debts	39	30
Share-based compensation expense	60	47
Changes in operating assets and liabilities:
Accounts receivable	(108)	9
Accrued unbilled revenues	124	132
Inventories	(37)	(60)
Other current assets	(68)	3
Accounts payable	(97)	(56)
Net regulatory assets and liabilities	(139)	(6)
Other current liabilities	(54)	(100)
Pension and other employee benefit obligations	(138)	(138)
Other, net	(103)	119
Net cash provided by operating activities	2,174	2,557
Investing activities
Capital/construction expenditures	(3,681)	(3,018)
Sale of MEC	684	0
Purchase of investment securities	(1,275)	(472)
Proceeds from the sale of investment securities	1,260	462
Other, net	(9)	(101)
Net cash used in investing activities	(3,021)	(3,129)
Financing activities
Proceeds from short-term borrowings, net	(95)	(105)
Proceeds from issuances of long-term debt	2,940	1,937
Repayments of long-term debt, including reacquisition premiums	(701)	(399)
Proceeds from issuance of common stock	5	457
Dividends paid	(638)	(587)
Other, net	(27)	(14)
Net cash provided by financing activities	1,484	1,289
Net change in cash and cash equivalents	637	717
Cash and cash equivalents at beginning of period	248	147
Cash and cash equivalents at end of period	885	864
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(582)	(544)
Cash (paid) received for income taxes, net	(17)	53
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	933	420
Inventory transfers to property, plant and equipment	250	64
Operating lease right-of-use assets	361	1,718
Allowance for equity funds used during construction	91	55
Issuance of common stock for equity awards	$ 51	$ 46