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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]  
Other Balance Sheet Information
The following table presents the accumulated depreciation included in property, plant and equipment, net and accumulated amortization included in intangible assets, net:
(In millions)September 30, 2021December 31, 2020
Property, plant and equipment accumulated depreciation $1,543 $1,936 
Intangible assets accumulated amortization 1,542 1,357 
Activity in Allowance for Credit Losses
The following table represents the activity in the allowance for credit losses for the three and nine months ended September 30, 2021 and 2020:
Three months ended September 30,Nine months ended September 30,
(In millions)2021202020212020
Beginning balance$761 $47 $67 $43 
Acquired balance from Direct Energy— — 112 — 
Provision for credit losses64 26 715 74 
Write-offs(41)(19)(124)(71)
Recoveries collected8 3 22 11 
Ending balance$792 $57 $792 $57 
Reconciliation of Cash and Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties
The following table provides a reconciliation of cash and cash equivalents, restricted cash and funds deposited by counterparties reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of cash flows:
(In millions)September 30, 2021December 31, 2020
Cash and cash equivalents
$259 $3,905 
Funds deposited by counterparties
1,748 19 
Restricted cash
14 6 
Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows
$2,021 $3,930