Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2023

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

Schedule II

Valuation and Qualifying Accounts

For the Years Ended December 31, 2023, 2022 and 2021 

(In millions) Description	Balance at Beginning of Period		Additions Charged to Costs and Expenses		Deductions		Other		Balance at End of Period
Allowance for credit losses - receivables:
2023	$	11	$	27	$	23	$	3	$	18
2022	28		22		39		—		11
2021	78		3		53		—		28
Obsolescence allowance—spare parts:
2023	$	610	$	102	$	23	$	—	$	689
2022	546		73		9		—		610
2021	478		79		11		—		546
Allowance for credit losses - investments in affiliates and other:
2023	$	21	$	20	$	—	$	(3)	$	38
2022	622		20		539		(82)		21
2021	522		1		—		99		622
Valuation allowance for deferred tax assets:
2023	$	199	$	(21)	$	—	$	1	$	179
2022	210		(10)		—		(1)		199
2021	247		(38)		—		1		210