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Other Financial Statement Items
 3 Months Ended
Mar. 31, 2024
Balance Sheet Related Disclosures [Abstract]  
Other Financial Statement Items Other Financial Statement Items
Accounts receivable and unbilled revenue, net
Accounts receivable and unbilled revenues, net as of March 31, 2024 and December 31, 2023 consisted of:
As of March 31, 2024December 31, 2023
(Millions)
Trade receivables and unbilled revenues$1,809 $1,749 
Allowance for credit losses(169)(161)
Accounts receivable and unbilled revenues, net$1,640 $1,588 
The change in the allowance for credit losses for the three months ended March 31, 2024 and 2023 consisted of:
Three Months Ended March 31,
(Millions)20242023
As of Beginning of Period,$161 $155 
Current period provision46 17 
Write-off as uncollectible(38)(24)
As of March 31,$169 $148 
The Deferred Payment Arrangements (DPA) receivable balance was $116 million and $110 million as of March 31, 2024 and December 31, 2023, respectively. The allowance for credit losses for DPAs at March 31, 2024 and December 31, 2023 was $46 million and $44 million respectively. Furthermore, the change in the allowance for credit losses associated with the DPAs for the three months ended March 31, 2024 and 2023, was $2 million and $(2) million, respectively.
Prepayments and other current assets
Included in prepayments and other current assets are $164 million and $142 million of prepaid other taxes as of March 31, 2024 and December 31, 2023, respectively.
Property, plant and equipment and intangible assets
The accumulated depreciation and amortization as of March 31, 2024 and December 31, 2023, respectively, were as follows:
 March 31,December 31,
As of20242023
(Millions)  
Property, plant and equipment  
Accumulated depreciation$12,732 $12,479 
Intangible assets  
Accumulated amortization$357 $351 
As of March 31, 2024 and 2023, accrued liabilities for property, plant and equipment additions were $553 million and $239 million, respectively.
Debt
Commercial Paper
As of March 31, 2024 and December 31, 2023, there was $1,864 million and $1,332 million of commercial paper outstanding, respectively. As of March 31, 2024 and December 31, 2023, the weighted-average interest rate on commercial paper was 5.55% and 5.65%, respectively.
Intragroup Green Loan
On July 19, 2023, we entered into a green term loan agreement with Iberdrola Financiación, S.A.U., a subsidiary of Iberdrola, with an aggregate principal amount of $800 million maturing on July 13, 2033 at an interest rate of 5.45% (the Intragroup Green Loan).
Other current liabilities
Included in other current liabilities are $224 million and $236 million of advances received as of March 31, 2024 and December 31, 2023, respectively.