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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II—Valuation and Qualifying Accounts
Schedule II—Valuation and Qualifying Accounts
The table below presents valuation and qualifying accounts for continuing operations. 
(Dollars in Millions) Additions  
DescriptionsBalance at
Beginning
Period		Charged to
Costs and
Expenses		Charged to
Other
Accounts		DeductionsBalance at
End of Period
Year ended December 31, 2021:
Deducted from accounts and notes receivable:
Allowance for credit losses$13 $— $— $— (a)$13 
Reserve for losses on uncompleted contracts$16 $4 $— $(3)$17 
Reserve for potentially disallowable costs incurred under government contracts$54 $42 $— $(20)$76 
Year ended December 31, 2020:
Deducted from accounts and notes receivable:
Allowance for credit losses$14 $11 $— $(12)(a)$13 
Reserve for losses on uncompleted contracts$10 $14 $— $(8)$16 
Reserve for potentially disallowable costs incurred under government contracts$58 $24 $— $(28)$54 
Year ended December 31, 2019:
Deducted from accounts and notes receivable:
Allowance for credit losses$9 $13 $3 (b)$(11)(a)$14 
Reserve for losses on uncompleted contracts$6 $12 $— $(8)$10 
Reserve for potentially disallowable costs incurred under government contracts$55 $5 $— $(2)$58 
(a)Receivable write-offs, net of recoveries
(b)Reserves of $3 million were recorded as a reduction in revenue