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Contract Asset & Liability (Tables)
 12 Months Ended
Dec. 31, 2021
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]  
Contract with Customer, Asset and Liability [Table Text Block] Total contract assets and contract liabilities as of December 31, 2021 and 2020 are as follows:
(dollars in millions)20212020
Contract assets$11,361 $9,931 
Contract liabilities(13,720)(12,889)
Net contract liabilities$(2,359)$(2,958)
Costs in Excess of Billings and Billings in Excess of Costs
Contract assets consisted of the following at December 31:
(dollars in millions)20212020
Unbilled$23,652 $20,336 
Progress payments(12,291)(10,405)
Total contract assets$11,361 $9,931