Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Summary of Significant Accounting Policies [Abstract]

Allowance for Credit Losses

The following table presents our allowance for credit losses activity for the years indicated:

	For the Year Ended December 31,
	2022			2021			2020
Balance at beginning of period	$	53		$	47		$	12
Charged to costs and expenses		6			7			9
Charged to other accounts (1)		1			4			29
Deductions		(6	)		(5	)		(3	)
Balance at end of period	$	54		$	53		$	47

(1) Amount presented for 2020 primarily relates to the reclassification of deferred revenue balances to allowance for credit losses in connection with customer bankruptcies and contractual disputes.

Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash and cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the amounts shown in the Statements of Consolidated Cash Flows.

	December 31,
	2022		2021
Cash and cash equivalents	$	76	$	2,820
Restricted cash		130		145
Total cash, cash equivalents and restricted cash shown in the    Statements of Consolidated Cash Flows	$	206	$	2,965

Environmental Reserves Activity

The following table presents the activity of our environmental reserves for the years indicated:

	For the Year Ended December 31,
	2022			2021			2020
Balance at beginning of period	$	4		$	5		$	7
Charged to costs and expenses		13			6			6
Acquisition-related additions and other		1			1			3
Deductions		(15	)		(8	)		(11	)
Balance at end of period	$	3		$	4		$	5

Asset Impairment Charges

The following table summarizes our asset impairment charges by type as presented on our Statements of Consolidated Cash Flows for the years indicated:

	For the Year Ended December 31,
	2022		2021		2020
Impairment charges reflected in operating costs and expenses:
Property, plant and equipment (see Note 4)	$	41	$	218	$	590
Goodwill		–		–		296
Other (1)		12		15		4
Total asset impairment charges in operating costs and expenses		53		233		890
Total asset impairment charges	$	53	$	233	$	890

(1) Primarily represents the write-down of surplus materials classified as current assets and intangible assets other than goodwill.