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SEC Schedule, Article 12-09, Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure
Item 15.     Exhibits, Financial Statements and Schedules.
(A)(1) and (2) Financial Statements
The consolidated financial statements of the registrants listed in the "Index to Financial Statements" on page F-1 together with the reports of PricewaterhouseCoopers LLP (PCAOB ID 238), independent auditors, are filed as part of this Annual Report.
(A)(3) Exhibits 
See Index to Exhibits.
The agreements included or incorporated by reference as exhibits to this Annual Report contain representations and warranties by each of the parties to the applicable agreement. These representations and warranties were made solely for the benefit of the other parties to the applicable agreement and (i) were not intended to be treated as categorical statements of fact, but rather as a way of allocating the risk to one of the parties if those statements prove to be inaccurate; (ii) may have been qualified in such agreement by disclosures that were made to the other party in connection with the negotiation of the applicable agreement; (iii) may apply contract standards of "materiality" that are different from "materiality" under the applicable securities laws; and (iv) were made only as of the date of the applicable agreement or such other date or dates as may be specified in the agreement. We acknowledge that, notwithstanding the inclusion of the foregoing cautionary statements, we are responsible for considering whether additional specific disclosures of material information regarding material contractual provisions are required to make the statements in this Annual Report not misleading.
(A)(4) Consolidated Financial Statement Schedules
Schedule II—Valuation and Qualifying Accounts for the years ended December 31, 2021, 2020 and 2019:
(in millions) Additions  
DescriptionBalance at
Beginning of
Period		Charged to
Costs and
Expenses		Charged to
Other
Accounts		DeductionsBalance at
End of
Period
Allowance for doubtful accounts (a)
Year ended December 31, 2021
$13 $2 $— $(4)$11 
Year ended December 31, 2020
11 9 — (7)13 
Year ended December 31, 2019
9 5 — (3)11 
Deferred tax asset valuation allowance
Year ended December 31, 2021
$21 $(1)$— $— $20 
Year ended December 31, 2020
17 4 — — 21 
Year ended December 31, 2019
18 (1)— — 17 
_______________
(a)The deduction column represents uncollectible accounts written off, net of recoveries from Trade Receivables, in the Consolidated Balance Sheets.