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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
(in millions)
Balance at
beginning of
period		Additions Charged to
Costs and
Expenses		Deductions Balance at
end of
period
Year Ended December 31, 2022
Valuation allowance for deferred tax assets$73 $30 $13 $90 
Allowance for obsolete inventory parts24 5 — 29 
Allowance for doubtful accounts3 16 15 
(1)
4 
Total$100 $51 $28 $123 
Year Ended December 31, 2021
Valuation allowance for deferred tax assets$69 $19 $15 $73 
Allowance for obsolete inventory parts27 4 7 24 
Allowance for doubtful accounts2 14 13 
(1)
3 
Total$98 $37 $35 $100 
Year Ended December 31, 2020
Valuation allowance for deferred tax assets$31 $38 $— $69 
Allowance for obsolete inventory parts22 5 — 27 
Allowance for doubtful accounts1 6 5 
(1)
2 
Total$54 $49 $5 $98 
 
(1)Uncollectible accounts written off, net of recoveries.