CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net income	$ 673	$ 582
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,043	942
Nuclear fuel amortization	56	65
Deferred income taxes	(67)	0
Allowance for equity funds used during construction	(32)	(61)
Earnings from equity method investments	(34)	(17)
Dividends from equity method investments	21	21
Provision for bad debts	27	26
Share-based compensation expense	21	41
Changes in operating assets and liabilities:
Accounts receivable	(63)	19
Accrued unbilled revenues	14	97
Inventories	7	15
Other current assets	24	7
Accounts payable	(15)	(160)
Net regulatory assets and liabilities	(794)	12
Other current liabilities	(265)	(241)
Pension and other employee benefit obligations	(128)	(146)
Other, net	1	(54)
Net cash provided by operating activities	489	1,148
Investing activities
Capital/construction expenditures	(1,967)	(2,569)
Purchase of investment securities	(628)	(1,160)
Proceeds from the sale of investment securities	410	1,150
Other, net	(17)	(1)
Net cash used in investing activities	(2,202)	(2,580)
Financing activities
Proceeds from short-term borrowings, net	1,161	815
Proceeds from issuances of long-term debt	1,821	2,447
Repayments of long-term debt, including reacquisition premiums	(399)	0
Dividends paid	(460)	(421)
Other, net	(1)	(23)
Net cash provided by financing activities	2,122	2,818
Net change in cash, cash equivalents and restricted cash	409	1,386
Cash, cash equivalents and restricted cash at beginning of period	129	248
Cash, cash equivalents and restricted cash at end of period (a)	538	1,634
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(390)	(364)
Cash paid for income taxes, net	(5)	(10)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions	509	436
Inventory transfers to property, plant and equipment	43	194
Operating lease right-of-use assets	1	8
Allowance for equity funds used during construction	32	61
Issuance of common stock for equity awards	$ 35	$ 35