CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 501	$ 3,905
Funds deposited by counterparties	55	19
Restricted cash	18	6
Accounts receivable, net	3,037	904
Inventory	316	327
Derivative instruments	1,816	560
Cash collateral paid in support of energy risk management activities	298	50
Prepayments and other current assets	511	257
Total current assets	6,552	6,028
Property, plant and equipment, net	2,328	2,547
Other Assets
Equity investments in affiliates	162	346
Operating lease right-of-use assets, net	312	301
Goodwill	1,572	579
Intangible assets, net	3,054	668
Nuclear decommissioning trust fund	909	890
Derivative instruments	1,008	261
Deferred income taxes	2,719	3,066
Other non-current assets	625	216
Total other assets	10,361	6,327
Total Assets	19,241	14,902
Current Liabilities
Current portion of long-term debt and finance leases	831	1
Current portion of operating lease liabilities	79	69
Accounts payable	2,216	649
Derivative instruments	1,606	499
Cash collateral received in support of energy risk management activities	55	19
Accrued expenses and other current liabilities	1,008	678
Total current liabilities	5,795	1,915
Other Liabilities
Long-term debt and finance lease	8,705	8,691
Non-current operating lease liabilities	280	278
Nuclear decommissioning reserve	308	303
Nuclear decommissioning trust liability	580	565
Derivative instruments	834	385
Deferred income taxes	30	19
Other non-current liabilities	1,192	1,066
Total other liabilities	11,929	11,307
Total Liabilities	17,724	13,222
Commitments and Contingencies
Stockholders' Equity
Common stock; $0.01 par value; 500,000,000 shares authorized; 423,519,121 and 423,057,848 shares issued and 244,693,206 and 244,231,933 shares outstanding at March 31, 2021 and December 31, 2020, respectively	4	4
Additional paid-in-capital	8,513	8,517
Accumulated deficit	(1,565)	(1,403)
Treasury stock, at cost - 178,825,915 shares at March 31, 2021 and December 31, 2020	(5,232)	(5,232)
Accumulated other comprehensive loss	(203)	(206)
Total Stockholders' Equity	1,517	1,680
Total Liabilities and Stockholders' Equity	$ 19,241	$ 14,902